Dell C2423H
Dell C2723H
Video Conferencing Monitor
User’s Guide
Model: C2423H/C2723H
Regulatory model: C2423Hb/C2723Hb
Securing Your Monitor Using Kensington Lock
Connecting the DisplayPort (DisplayPort to DisplayPort)
Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Connecting the Monitor for DP Multi-Stream Transport
Adjusting the Rotation Display Settings of Your
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FCC Notices (U.S. only) and Other Regulatory
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Safety Instructions
WARNING: Use of controls, adjustments, or procedures other than
those specified in this documentation may result in exposure to shock,
electrical hazards, and/or mechanical hazards.
• Place the monitor on a solid surface and handle it carefully. The screen is
fragile and can be damaged if dropped or hit sharply.
• Always be sure that your monitor is electrically rated to operate with the AC
power available in your location.
• Keep the monitor in room temperature. Excessive cold or hot conditions can
have an adverse effect on the liquid crystal of the display.
• Do not subject the monitor to severe vibration or high impact conditions. For
example, do not place the monitor inside a car trunk.
• Unplug the monitor when it is going to be left unused for an extended period
of time.
• To avoid electric shock, do not attempt to remove any cover or touch the
inside of the monitor.
For information on safety instructions, see the Safety, Environmental, and
Regulatory Information (SERI) document that is shipped with your monitor.
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Safety Instructions
About Your Monitor
Package Contents
Your monitor ships with the components shown in the table below. If any
component is missing, contact Dell technical support. For more information, see
NOTE: Some items may be optional and may not ship with your monitor.
Some features may not be available in certain countries.
NOTE: If you are attaching a stand that you purchased from any other
source, follow the set up instructions that were included with the
stand.
Display
Stand Riser
Stand Base
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Power Cable (varies by
country)
DisplayPort to DisplayPort
cable
Cable length: 1.80 M
HDMI Cable
Cable length: 1.80 M
SuperSpeed USB 5 Gbps
(USB 3.2 Gen1) Type-A to
Type-B Upstream Cab le
(Enables the USB Ports on
the Monitor)
Cable length: 1.80 M
• Quick Setup Guide
• Safety, Environmental,
and Regulatory
Information
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Product Features
The Dell C2423H/C2723H monitor has an active matrix, Thin-Film Transistor
(TFT), Liquid Crystal Display (LCD) and LED backlight. The monitor features
include:
• C2423H: 60.47 cm (23.80 in.) viewable area (measured diagonally). 1920 x
1080 (16:9) resolution, plus full-screen support for lower resolutions.
• C2723H: 68.58 cm (27.00 in.) viewable area (measured diagonally). 1920 x
1080 (16:9) resolution, plus full-screen support for lower resolutions.
• Built-in speakers (2 x 5 W).
• Wide viewing angle to allow viewing from a sitting or standing position.
• Color gamut of sRGB 99%.
• Digital connectivity with DisplayPort and HDMI.
• Tilt, swivel, height, and rotate adjustment capabilities.
• Ultra-thin bezel minimizes the bezel gap in multi-monitor usage, enabling
easier setup with an elegant viewing experience.
• Removable stand and Video Electronics Standards Association (VESA™)
100 mm mounting holes for flexible mounting solutions.
• Equipped with 1 USB Type-B (USB 3.2 Gen1) upstream port, 2 SuperSpeed
USB 5 Gbps (USB 3.2 Gen1) Type-A downstream ports, and 2 SuperSpeed
USB 5 Gbps (USB 3.2 Gen1) Type-A downstream charging ports (BC 1.2).
• Plug and play capability if supported by your system.
• On-Screen Display (OSD) adjustments for ease of set-up and screen
optimization.
• Power and OSD buttons lock.
• Security lock slot.
• Stand lock.
• < 0.3 W in Standby Mode.
®
• Certified for Windows Hello (Face Authentication) and supports Microsoft
®
Cortana .
• The monitor uses Low Blue Light panel and is in compliance with TUV
Rheinland (Hardware Solution) at factory reset/default setting mode.
• Decreases the level of hazard blue light emitted from the screen to make
viewing more comfortable for your eyes.
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• The monitor adopts Flicker-Free technology, which clears the eye visible
flicker, brings comfort viewing experience and preventing users suffer from
eye strain and fatigue.
• Optimize eye comfort with a flicker-free screen and low blue light feature.
WARNING: The possible long-term effects of blue light emission from
the monitor may cause damage to the eyes, including eye fatigue,
digital eye strain, and so on. ComfortView Plus feature is designed to
reduce the amount of blue light emitted from the monitor to optimize
eye comfort. The monitors use Low Blue Light panel and is in
compliance with TUV Rheinland (Hardware Solution) at factory reset/
default setting mode (Brightness: 75%, Contrast: 75%, Preset mode:
Standard)
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About Your Monitor
Identifying Parts and Controls
Front View
Front View with Monitor Stand
No.
1
Description
Microphones
IR LED
Use
Monitor microphones (Mic).
2
Indicator of infrared (IR).
3
Webcam lens
Transmits your image in a video conference.
4
Webcam LED
indicator
Indicator of Webcam. It will light up in white when
webcam is in use.
5
6
Speaker mute & Press to mute and unmute speaker.
LED
LED will light up in static white when speaker is
muted.
LED will go dark when speaker is enabled/unmuted.
Short press for 2 unit volume decrement.
Long press for continuous volume decrement.
Volume down &
LED
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8
Volume up & LED Short press for 2 unit volume increment.
Long press for continuous volume increment.
Microphone mute Press to mute and unmute microphone.
& LED
LED will light up in static red when mic is muted.
LED will go dark when mic is enabled/unmuted.
9
Power LED
indicator
Solid white light indicates that the monitor is turned
on and functioning normally. Breathing white light
indicates that the monitor is in Standby Mode.
Back View
Back View with Monitor Stand
No.
1
Description
Use
VESA mounting holes (100 mm Wall mount monitor using VESA-
x 100 mm - behind the attached compatible wall mount kit (100 mm x
VESA Cover)
100 mm).
2
3
4
Regulatory label
Stand release button
Lists the regulatory approvals.
Releases stand from the monitor.
Barcode, serial number, and
Service Tag label
Contains monitor details and support
information. Refer to this label if you
need to contact Dell for technical
support.
5
Power On/Off button
To turn the monitor on or off.
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6
7
Joystick
Use to control the OSD menu. (For
more Information, see Operating the
Cable-management slot
Use to organize cables by inserting
them through the slot.
Bottom View
Bottom View without Monitor Stand
No.
Description
Use
1
Power connector
Security lock slot
HDMI port
Connect the power cable (shipped with your
monitor).
2
3
4
5
Secures the monitor with security lock
(security lock not included).
Connect your computer with the HDMI
cable.
Stand lock feature
DisplayPort
To lock the stand to the monitor using a M3 x
6 mm screw (screw not included).
Connect your computer with the DisplayPort
cable.
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6
DisplayPort (out)
DisplayPort output for MST (multi-stream
transport) capable monitor. To enable MST,
NOTE: Remove the rubber plug when using
DisplayPort out connector.
7
8
SuperSpeed USB 5
Gbps (USB 3.2 Gen1)
Type-B upstream port
Connect the USB cable that comes with your
monitor to the computer. Once this cable is
connected, you can use the USB connectors
on the monitor.
SuperSpeed USB 5
Gbps (USB 3.2 Gen1)
Type-A downstream
port (2)
Connect your USB device.*
NOTE: To use this port, you must connect
the USB upstream cable (shipped with your
monitor) to the USB Type-B upstream port
on the monitor and to your computer.
9
SuperSpeed USB 5
Gbps (USB 3.2 Gen1)
Type-A downstream
port with Power
Connect your USB device* or charge your
device
NOTE: To use this port, you must connect
the USB upstream cable (shipped with your
monitor) to the USB Type-B upstream port
on the monitor and to your computer.
Charging (BC 1.2)
10
Headphone jack
Connect headphones or headset to playback
audio through HDMI or DisplayPort audio
channels.
CAUTION: Increasing the audio output
beyond 50% on the volume control or
equalizer may increase the output
voltage on the headphones thereby
increasing the sound pressure levels.
11
Built-in speakers
To output the sound from audio input.
*To avoid signal interference, when a wireless USB device has been connected to a
USB downstream port, it is NOT recommended to connect any other USB devices
to the adjacent port(s).
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Monitor Specifications
Model
C2423H
Active matrix - TFT LCD
C2723H
Screen type
Panel technology
Aspect ratio
In-Plane Switching Technology
16:9
Viewable Image
Diagonal
604.70 mm (23.80 in.)
527.04 mm (20.75 in.)
296.46 mm (11.67 in.)
685.80 mm (27.00 in.)
Width (active area)
Height (active area)
Total area
597.89 mm (23.54 in.)
336.31 mm (13.24 in.)
2
2
156246.28 mm
201076.38 mm
2
2
(242.18 in. )
(311.67 in. )
Pixel pitch
0.2745 mm x 0.2745 mm
92.53
0.3114 mm x 0.3114 mm
81.59
Pixel per inch (PPI)
Viewing angle
178° (vertical) typical
178° (horizontal) typical
250 cd/m² (typical)
1000 to 1 (typical)
Anti-Glare with 3H hardness
LED
Luminance output
Contrast ratio
Faceplate coating
Backlight
300 cd/m² (typical)
Response time
8 ms (Normal)
5 ms (Fast)
Color depth
16.78 million colors
sRGB 99%
Color gamut
Built-in devices
1 x USB 3.2 Gen1 upstream port
4 x USB 3.2 Gen1 downstream ports
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Connectivity
• 1 x DisplayPort version 1.2* (HDCP 1.4)
• 1 x HDMI port version 1.4 (HDCP 1.4)
• 1 x DisplayPort (Out) with MST
• 1 x USB Type-B (USB 3.2 Gen1) upstream port
• 2 x SuperSpeed USB 5 Gbps (USB 3.2 Gen1)
downstream ports
• 2 x SuperSpeed USB 5 Gbps (USB 3.2 Gen1)
downstream ports with BC1.2 charging capability at
2 A (maximum)
• 1 x 3.5 mm headphone jack
Border width (edge of
monitor to active area)
5.37 mm (Top)
5.99 mm (Top)
5.38 mm (Left/Right)
17.06 mm (Bottom)
6.01 mm (Left/Right)
17.06 mm (Bottom)
Adjustability
Height adjustable stand 150 mm
Til t
-5° to 21°
Swivel
Pivot
-45° to 45°
-90° to 90°
Dell Display Manager
(DDM) compatibility
Easy Arrange and other key features
Security
Security lock slot (cable lock sold separately)
*DisplayPort 1.2/MST/DP audio is supported.
Resolution Specifications
Model
C2423H/C2723H
Horizontal scan range
Vertical scan range
Maximum preset resolution
30 kHz to 83 kHz (automatic)
56 Hz to 76 Hz (automatic)
1920 x 1080 at 60 Hz
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Supported Video Modes
Model
C2423H/C2723H
Video display capabilities (HDMI 480p, 576p, 720p, 1080i*, 1080p
& DisplayPort)
*Supported by HDMI input only.
Preset Display Modes
Display Mode
Horizontal
Frequency Frequency
Vertical
Pixel
Clock
(MHz)
Sync
Polarity
(Horizontal
/Vertical)
(kHz)
(Hz)
VESA, 720 x 400
VESA, 640 x 480
VESA, 640 x 480
VESA, 800 x 600
VESA, 800 x 600
VESA, 1024 x 768
VESA, 1024 x 768
VESA, 1152 x 864
VESA, 1280 x 1024
VESA, 1280 x 1024
VESA, 1600 x 900
VESA, 1920 x 1080
31.47
31.47
37.50
37.88
46.88
48.36
60.02
67.50
64.00
80.00
60.00
67.50
70.08
60.00
75.00
60.32
75.00
60.00
75.03
75.00
60.02
75.02
60.00
60.00
28.32
25.17
-/+
-/-
31.50
-/-
40.00
49.50
65.00
78.75
+/+
+/+
-/-
+/+
+/+
+/+
+/+
+/+
+/+
108.00
108.00
135.00
108.00
148.50
NOTE: The + or - sign in Sync polarity denotes that the video sync
signal is triggered by either the positive edge or the negative edge,
respectively.
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Multi-Stream Transport (MST) Modes
MST Source Monitor
Maximum Number of External Monitors that
can be Supported
1920 x 1080 at 60 Hz
• 3
1920 x 1080 at 60 Hz
Unified Communications (UC) Platform Compatibility List
The table below highlights the call functions that work on the Dell Video
Conferencing Monitor – C2423H and C2723H when using the following UC
#
platforms .
Buttons
Teams app
Zoom app
Other UC apps
(Skype for Business, Google
Hangouts, Blue Jeans, Cisco
Webex, FaceTime, Slack,
GoToMeeting)
Speaker Mute
Volume Down
Volume Up
√
√
√
√
√
√
√
√
√
√
*
*
Microphone Mute
√
√
√ Call function works with the UC platform.
* Mute function works by pressing the Mute button, but the Mute Icon on the UC
platform is not sync (Icon shows unmute).
# On Windows 10 64 Bit OS.
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Electrical Specifications
Model
C2423H
C2723H
Video input signals
• HDMI 1.4*/DisplayPort 1.2**, 600 mV for each
differential line, 100 ohm input impedance per
differential pair
AC input voltage/
frequency/current
100 VAC to 240 VAC / 50 Hz or 60 Hz 3 Hz / 1.5 A
(typical)
Inrush current
• 120 V: 30 A (Max.) at
0°C (cold start)
• 120 V: 40 A (Max.) at
0°C (cold start)
• 240 V: 60 A (Max.) at
0°C (cold start)
• 240 V: 80 A (Max.) at
0°C (cold start)
1
1
Power consumption
• 0.3 W (Off mode)
• 0.2 W (Off mode)
1
1
• 0.3 W (Standby mode) • 0.3 W (Standby mode)
1
1
• 12.6 W (On mode)
• 13.2 W (On mode)
2
2
• 82 W (Max.)
• 85 W (Max.)
3
3
• 11.51 W (Pon)
• 11.80 W (Pon)
3
3
• 36.88 kWh (TEC)
• 37.72 kWh (TEC)
*Not supporting the HDMI 1.4 optional specification, including HDMI Ethernet
Channel (HEC), Audio Return Channel (ARC), standard for 3D format and
resolutions, and standard for 4K digital cinema resolution.
**DisplayPort 1.2/MST/DP audio is supported.
1
As defined in EU 2019/2021 and EU 2019/2013.
2
Max brightness and contrast setting with maximum power loading on all USB
ports.
3
P : Power consumption of On mode as defined in Energy Star 8.0 version.
on
TEC: Total energy consumption in kWh as defined in Energy Star 8.0 version.
This document is informational only and reflects laboratory performance. Your
product may perform differently, depending on the software, components and
peripherals you ordered and shall have no obligation to update such information.
Accordingly, the customer should not rely upon this information in making
decisions about electrical tolerances or otherwise. No warranty as to accuracy or
completeness is expressed or implied.
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NOTE: This monitor is ENERGY STAR certified.
This product qualifies for ENERGY STAR in the factory
default settings which can be restored by “Factory Reset”
function in the OSD menu. Changing the factory default
settings or enabling other features may increase power
consumption that could exceed the ENERGY STAR specified
limit.
Webcam and Microphone Specifications
Model
C2423H/C2723H
Field of view
Focus mode
Lens
88.9° for 2560 x 1920
Fixed Focus
Focus area
35 cm ~ 1.5 m
70 cm
Focusing distance
(normal mode)
Image Sensor
Active array size
Video frame rate
5 mega-pixel
Video Specification
1920 x 1080 (Full HD)- up
to 30 frames per second
Audio Specification
Interface
Microphone type
Digital microphone x 2
USB 2.0 High Speed
Power Supply
3.3 volts +/- 5% for USB and Microphone
5 volts +/- 5% for IR camera
Speaker Specifications
Model
C2423H/C2723H
2 x 5 W
Speaker rated power
Frequency Response
Impedance
200 Hz - 16 kHz
8 ohm
20
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Physical Characteristics
Model
C2423H
C2723H
Signal Cable Type
• Digital: DisplayPort, 20 pins
• Digital: HDMI, 19 pins
• Universal Series Bus: USB Type-A to B
NOTE: Dell monitors are designed to work optimally with the video cables that
are shipped with your monitor. As Dell does not have control over the different
cable suppliers in the market, the type of material, connector and process used to
manufacture these cables, Dell does not guarantee video performance on cables
that are not shipped with your Dell monitor.
Monitor Dimensions (with stand)
Height (extended)
Height (compressed)
Width
496.10 mm (19.53 in.)
364.00 mm (14.33 in.)
537.80 mm (21.17 in.)
179.57 mm (7.07 in.)
534.15 mm (21.03 in.)
384.15 mm (15.12 in.)
609.90 mm (24.01 in.)
190.10 mm (7.48 in.)
Depth
Monitor Dimensions (without stand)
Height
318.89 mm (12.55 in.)
359.37 mm (14.15 in.)
609.90 mm (24.01 in.)
59.38 mm (2.34 in.)
Width
537.80 mm (21.17 in.)
57.85 mm (2.28 in.)
Depth
Stand Dimensions
Height (extended)
Height (compressed)
Width
410.80 mm (16.17 in.)
364.00 mm (14.33 in.)
245.00 mm (9.65 in.)
179.57 mm (7.07 in.)
428.30 mm (16.86 in.)
381.50 mm (15.02 in.)
268.00 mm (10.55 in.)
190.10 mm (7.48 in.)
Depth
Base
245.00 mm (9.65 in.) x
173.00 mm (6.81 in.)
268.00 mm (10.55 in.) x
185.00 mm (7.28 in.)
Monitor Weight
Model
C2423H
C2723H
Weight with packaging 8.33 kg (18.36 lb)
10.01 kg (22.07 lb)
7.24 kg (15.96 lb)
Weight with stand
6.02 kg (13.27 lb)
assembly and cables
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Weight without stand
assembly (For wall
mount or VESA mount
considerations - no
cables)
3.83 kg (8.44 lb)
5.04 kg (11.11 lb)
1.76 kg (3.88 lb)
Weight of stand
assembly
1.76 kg (3.88 lb)
2-4
Front frame gloss
Monitor Environmental Characteristics
Model
C2423H
C2723H
Compliant Standards
• ENERGY STAR certified monitor
• EPEAT registered where applicable. EPEAT registration varies by country. See
www.epeat.net for registration status by country.
• RoHS-compliant
• TCO Certified and TCO Certified Edge
• BFR/PVC free monitor (excluding external cables)
• Meets NFPA 99 leakage current requirements
• Arsenic-free glass and Mercury-free for the panel only
Temperature
Operating
0°C to 40°C (32°F to 104°F)
Non-operating
• Storage: -20°C to 60°C (-4°F to 140°F)
• Shipping: -20°C to 60°C (-4°F to 140°F)
Humidity
Operating
10% to 80% (non-condensing)
Non-operating
• Storage: 5% to 90% (non-condensing)
• Shipping: 5% to 90% (non-condensing)
Altitude
Operating
5000 m (16404 ft) (maximum)
12192 m (40000 ft) (maximum)
Non-operating
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About Your Monitor
Thermal Dissipation
• 279.78 BTU/hour • 290.03 BTU/hour
(maximum)
(maximum)
• 40.94 BTU/hour
(typical)
• 45.04 BTU/hour
(typical)
Pin Assignments
DP Port (in)
Pin
Number
20-pin Side of the
Connected Signal Cable
1
2
ML3 (n)
GND
3
ML3 (p)
ML2 (n)
GND
4
5
6
ML2 (p)
ML1 (n)
GND
7
8
9
ML1 (p)
ML0 (n)
GND
10
11
12
13
14
15
16
17
18
19
20
ML0 (p)
GND
GND
AUX (p)
GND
AUX (n)
Hot Plug Detect
Re-PWR
+3.3 V DP_PWR
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DP Port (out)
Pin
20-pin Side of the
Number
Connected Signal Cable
1
2
ML0 (p)
GND
3
ML0 (n)
ML1 (p)
GND
4
5
6
ML1 (n)
ML2 (p)
GND
7
8
9
ML2 (n)
ML3 (p)
GND
10
11
12
13
14
15
16
17
18
19
20
ML3 (n)
CONFIG1
CONFIG2
AUX CH (p)
GND
AUX CH (n)
Hot Plug Detect
Return
DP_PWR
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HDMI Port
Pin
19-pin Side of the
Number
Connected Signal Cable
1
TMDS DATA 2+
2
TMDS DATA 2 SHIELD
TMDS DATA 2-
3
4
TMDS DATA 1+
5
TMDS DATA 1 SHIELD
TMDS DATA 1-
6
7
TMDS DATA 0+
8
TMDS DATA 0 SHIELD
TMDS DATA 0-
9
10
11
12
13
14
15
16
17
18
19
TMDS CLOCK+
TMDS CLOCK SHIELD
TMDS CLOCK-
CEC
Reserved (N.C. on device)
DDC CLOCK (SCL)
DDC DATA (SDA)
DDC/CEC Ground
+5 V POWER
HOT PLUG DETECT
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Universal Serial Bus (USB) Interface
This section gives you information about the USB ports that are available on the
monitor.
NOTE: This monitor is SuperSpeed USB 5 Gbps (USB 3.2 Gen1) and
High-speed USB 2.0 compatible.
USB 3.2 Gen1
Transfer Speed
SuperSpeed
High speed
Data Rate
5 Gbps
Power Supported
Power Supported
4.5 W
4.5 W
4.5 W
480 Mbps
12 Mbps
Full speed
USB 2.0
Transfer Speed
High speed
Full speed
Data Rate
480 Mbps
12 Mbps
1.5 Mbps
2.5 W
2.5 W
2.5 W
Low speed
USB Upstream Connector
Pin Number
9-pin Side of the
Connector
1
VCC
D-
2
3
4
5
D+
GND
SSTX-
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6
7
8
9
SSTX+
GND
SSRX-
SSRX+
USB Downstream Connector
Pin Number 9-pin Side of the Connector
1
VCC
2
3
4
5
6
7
8
9
D-
D+
GND
SSRX-
SSRX+
GND
SSTX-
SSTX+
USB Ports
• 1 USB Type-B (USB 3.2 Gen1) upstream port - bottom
• 4 SuperSpeed USB 5 Gbps (USB 3.2 Gen1) Type-A downstream ports-
2 at bottom, 2 at rear
Power Charging Port - the ports with
battery icon supports fast current
charging capability if the device is BC 1.2 compatible.
NOTE: SuperSpeed USB 5 Gbps (USB 3.2 Gen1) functionality requires a
SuperSpeed USB 5 Gbps (USB 3.2 Gen1)-capable computer.
NOTE: The USB ports on the monitor work only when the monitor is
turned On or in Standby Mode. If you turn Off the monitor and then
turn it On, the attached peripherals may take a few seconds to resume
normal functionality.
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Plug and Play Capability
You can connect the monitor to any Plug and Play-compatible system. The monitor
automatically provides the computer system with its Extended Display Identification
Data (EDID) using Display Data Channel (DDC) protocols so that the system can
configure itself and optimize the monitor settings. Most monitor installations are
automatic; you can select different settings if desired. For more information about
LCD Monitor Quality and Pixel Policy
During the LCD Monitor manufacturing process, it is not uncommon for one or more
pixels to become fixed in an unchanging state which are hard to see and do not
affect the display quality or usability. For more information on Dell Monitor Quality
Ergonomics
CAUTION: Improper or prolonged usage of keyboard may result in
injury.
CAUTION: Viewing the monitor screen for extended periods of time may
result in eye strain.
For comfort and efficiency, observe the following guidelines when setting up and
using your computer workstation:
• Position your computer so that the monitor and keyboard are directly in front
of you as you work. Special shelves are commercially available to help you
correctly position your keyboard.
• To reduce the risk of eye strain and neck/arm/back/shoulder pain from using
the monitor for long periods of time, we suggest you to:
1. Set the distance of the screen between 20 to 28 in. (50 - 70 cm) from your
eyes.
2. Blink frequently to moisten your eyes or wet your eyes with water after
prolonged usage of the monitor
3. Take regular and frequent breaks for 20 minutes every two hours.
4. Look away from your monitor and gaze at a distant object at 20 feet away
for at least 20 seconds during the breaks.
5. Perform stretches to relieve tension in the neck, arm, back, and shoulders
during the breaks.
• Make sure that the monitor screen is at eye level or slightly lower when you
are sitting in front of the monitor.
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About Your Monitor
• Adjust the tilt of the monitor, its contrast, and brightness settings.
• Adjust the ambient lighting around you (such as overhead lights, desk lamps,
and the curtains or blinds on nearby windows) to minimize reflections and
glare on the monitor screen.
• Use a chair that provides good lower-back support.
• Keep your forearms horizontal with your wrists in a neutral, comfortable
position while using the keyboard or mouse.
• Always leave space to rest your hands while using the keyboard or mouse.
• Let your upper arms rest naturally on both sides.
• Ensure that your feet are resting flat on the floor.
• When sitting, make sure that the weight of your legs is on your feet and not on
the front portion of your seat. Adjust your chair's height or use a footrest if
necessary to maintain a proper posture.
• Vary your work activities. Try to organize your work so that you do not have to
sit and work for extended periods of time. Try to stand or get up and walk
around at regular intervals.
• Keep the area under your desk clear of obstructions and cables or power
cords that may interfere with comfortable seating or present a potential trip
hazard.
monitor screen at or
below eye level
monitor and
keyboard
positioned
directly in front
of the user
wrists relaxed
and flat
feet flat on the
floor
About Your Monitor
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Handling and Moving Your Display
To ensure the monitor is handled safely when lifting or moving it, follow the
guidelines mentioned below:
• Before moving or lifting the monitor, turn off your computer and the monitor.
• Disconnect all cables from the monitor.
• Place the monitor in the original box with the original packing materials.
• Hold the bottom edge and the side of the monitor firmly without applying
excessive pressure when lifting or moving the monitor.
• When lifting or moving the monitor, ensure the screen is facing away from you
and do not press on the display area to avoid any scratches or damage.
• When transporting the monitor, avoid any sudden shock or vibration to it.
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• When lifting or moving the monitor, do not turn the monitor upside down while
holding the stand base or stand riser. This may result in accidental damage to
the monitor or cause personal injury.
Maintenance Guidelines
Cleaning Your Monitor
Improper cleaning methods can result in physical damage to Dell monitors. Physical
defects may affect the screen and body of the monitor.
monitor.
WARNING: Before cleaning the monitor, unplug the monitor power
cable from the electrical outlet.
For best practices, follow the instructions in the list below when unpacking,
cleaning, or handling your monitor:
• To clean the Dell Monitor screen, lightly dampen a soft, clean cloth with
water. If possible, use a special screen-cleaning tissue or solution suitable for
the Dell Monitor screen.
CAUTION: Do not use detergents of any kind or other chemicals such as
benzene, thinner, ammonia, abrasive cleaners, or compressed air.
• Do not directly spray the cleaning solution or even water on the
surface of the monitor. Directly spraying liquid onto the panel will roll down
to the bottom of the panel and corrode the electronics resulting in permanent
damage. Instead, apply solution or water to soft cloth material.
About Your Monitor
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NOTE: Using cleaner may cause changes in the appearance of the
monitor, such as color fading, milky film on the monitor, deformation,
uneven dark shade, and screen surface peeling.
NOTE: Monitor damage due to improper cleaning methods and the use
of benzene, thinner, ammonia, abrasive cleaners, alcohol, compressed
air, detergent of any kind will lead to a Customer Induced Damage
(CID). CID is not covered under the standard Dell warranty.
• If you notice white powder when you unpack your monitor, wipe it off with a
cloth.
• Handle your monitor with care as a darker-colored monitor may get scratched
and show white scuff marks more than a lighter-colored monitor.
• To help maintain the best image quality on your monitor, use a dynamically
changing screen saver and turn off your monitor when not in use.
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About Your Monitor
Setting Up the Monitor
Setting Up the Stand
NOTE: The stand is not factory-installed.
NOTE: The following steps are specifically for setting up the stand that
is shipped with your monitor. If you are attaching a stand that you
purchased from any other source, follow the set up instructions that
were included with the stand.
To set up the monitor stand:
1. Follow the instructions on the flaps of packaging box to remove the stand
from the top cushion that secures it.
2. Remove the stand base and stand riser from the packaging cushion.
C2423H
C2723H
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3. Align and place the stand riser on the stand base.
4. Open the screw handle at the bottom of the stand base and turn it clockwise
to secure the stand assembly.
5. Close the screw handle.
6. Open the protective cover to access the VESA slot on the display.
C2423H
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C2723H
NOTE: Before attaching the stand assembly to the display, ensure that
the front plate flap is opened to allow space for assembly.
7. Attach the stand assembly to the display.
a. Align and slide the tabs on the stand riser into the VESA slot.
b. Press the stand down till it snaps into place.
C2423H
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C2723H
8. Hold the stand riser with both hands firmly and lift the monitor. Then place
the monitor in an upright position on a flat surface.
NOTE: Hold the stand riser firmly when lifting the monitor to avoid any
accidental damage.
C2423H
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C2723H
9. Lift the protective cover from the monitor.
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Operating the Monitor Webcam
When you want to use the monitor built-in webcam, press down on the webcam
module and then release. The webcam module will pop up.
Organizing Your Cables
After attaching all necessary cables to your monitor and computer (See Connecting
Your Monitor for cable attachment), organize all cables as shown above.
If your cable is not able to reach your PC, you may connect directly to the PC
without routing through the slot on the monitor stand.
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Securing Your Monitor Using Kensington Lock (optional)
The security-lock slot is located at the bottom of the monitor (see Security lock
slot). Secure your monitor to a table using the Kensington security lock.
For more information on using the Kensington lock (sold separately), see the
documentation that is shipped with the lock.
NOTE: The image is for the purpose of illustration only. The appearance
of the lock may vary.
Connecting Your Monitor
WARNING: Before you begin any of the procedures in this section,
NOTE: Dell monitors are designed to work optimally with Dell supplied
inbox cables. Dell does not guarantee the video quality and performance
when using non-Dell cables.
NOTE: Route the cables through the cable-management slot before
connecting them.
NOTE: Do not connect all cables to the computer at the same time.
NOTE: The graphics are used for the purpose of illustration only.
Appearance of the computer may vary.
To connect your monitor to the computer:
1. Turn Off your computer and disconnect the power cable.
2. Connect the DisplayPort or HDMI cable from your monitor to the computer.
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Connecting the HDMI Cable
NOTE: The default out of factory setting is HDMI 1.4.
Connecting the DisplayPort (DisplayPort to DisplayPort) Cable
NOTE: The default out of factory setting is DP1.2. If the monitor fails to
show any content after the DisplayPort cable is connected, follow the
procedures below to change the settings to DP1.1:
• Press the joystick to open the Menu Launcher.
• Toggle the joystick to select Input Source.
• Toggle the joystick to highlight DP.
• Press and hold the joystick for approximately 10 seconds, and the DisplayPort
configuration message appears.
• Toggle the joystick to select Yes and then press the joystick to save the
changes.
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Repeat the above steps to change the DisplayPort format settings if
necessary.
Connecting the Monitor for DP Multi-Stream Transport (MST) Function
NOTE: This monitor supports the DP MST feature. To make use of this
feature, your PC Graphics Card must be certified to at least DP1.2 with
MST option.
NOTE: Remove the rubber plug when using DP out connector.
CAUTION: The graphics are used for the purpose of illustration only.
Appearance of the computer may vary.
If your monitor displays an image, installation is complete. If it does not display an
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Using the Tilt, Swivel, and Vertical Extension
NOTE: The following instructions are applicable only for attaching the
stand that was shipped with your monitor. If you are attaching a stand
that you purchased from any other source, follow the set up
instructions that were included with the stand.
Til t, Swivel
With the stand attached to the monitor, you can tilt and swivel the monitor for the
most comfortable viewing angle.
NOTE: The stand is not installed at the factory when shipped.
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Rotate Clockwise
Rotate Counterclockwise
NOTE: To use the Display Rotation function (Landscape versus Portrait
view) with your Dell computer, you require an updated graphics driver
that is not included with this monitor. To download the graphics driver,
Drivers for latest driver updates.
NOTE: When in the Portrait View Mode, you may experience
performance degradation in graphic-intensive applications (3D Gaming
and etc.).
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Adjusting the Rotation Display Settings of Your System
After you have rotated your monitor, you need to complete the procedure below to
adjust the Rotation Display Settings of your system.
NOTE: If you are using the monitor with a non-Dell computer, you need
to go the graphics driver website or your computer manufacturer
website for information on rotating the 'contents' on your display.
To adjust the Rotation Display Settings:
1. Right-click on the desktop and click Properties.
2. Select the Settings tab and click Advanced.
3. If you have an ATI graphics card, select the Rotation tab and set the
preferred rotation.
4. If you have an nVidia graphics card, click the nVidia tab, in the left-hand
column select NVRotate, and then select the preferred rotation.
®
5. If you have an Intel graphics card, select the Intel graphics tab, click
Graphic Properties, select the Rotation tab, and then set the preferred
rotation.
NOTE: If you do not see the rotation option or it is not working
for your graphics card.
your display.
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Removing the Monitor Stand
NOTE: To prevent scratches on the LCD screen when removing the
stand, ensure that the monitor is placed on a soft, clean surface.
NOTE: The following instructions are applicable only for attaching the
stand that was shipped with your monitor. If you are attaching a stand
that you purchased from any other source, follow the set up
instructions that were included with the stand.
To remove the stand:
1. Place the monitor on a soft cloth or cushion.
2. Press and hold the stand release button.
3. Lift the stand up and away from the monitor.
VESA Wall Mounting (optional)
(Screw dimension: M4 x 10 mm).
Refer to the instructions that come with the VESA-compatible wall mounting kit.
1. Place the monitor panel on a soft cloth or cushion on a stable flat table.
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3. Use a Phillips crosshead screwdriver to remove the four screws securing the
plastic cover.
4. Attach the mounting bracket from the wall mounting kit to the monitor.
5. Mount the monitor on the wall. For more information, see the documentation
that shipped with the wall mounting kit.
NOTE: For use only with UL or CSA or GS-listed wall mount bracket
with minimum weight or load bearing capacity of 15.32 kg (C2423H)/
20.16 kg (C2723H).
Setting Up the Monitor
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Operating the Monitor
Power On the Monitor
Press the Power Button to turn On the monitor.
Using the Joystick Control
To modify the OSD adjustments using the joystick control on the rear end of the
monitor, do the following:
1. Press the joystick button to launch the OSD Menu Launcher.
2. Move the joystick up/down/left/right to toggle between the OSD menu
options.
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Joystick Functions
Function
Description
Press joystick to open the OSD Menu Launcher.
• For right and left navigation.
• Move right to enter the submenu.
• Move left to exit from the submenu.
• For up and down navigation.
• Toggle between the menu items.
• Increases (up) or decreases (down) the parameters
of the selected menu item.
Using the Main Menu
Using the Menu Launcher
Press the joystick to open the OSD Menu Launcher.
Menu Launcher
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The following table describes the Menu Launcher functions:
Menu Launcher Details
Menu Launcher Icon
Main Menu
Description
Opens the On-Screen Display (OSD). See
Adjusts the aspect ratio of your screen.
Aspect Ratio
(Shortcut Key 1)
• Sets the Input Source.
• Select Auto from Input Source menu to scan
Input Source
(Shortcut Key 2)
for available input sources.
Allows you to choose from a list of preset color
modes.
Preset Modes
(Shortcut Key 3)
Select this icon to adjust the brightness and
contrast level.
Brightness/Contrast
(Shortcut Key 4)
Displays the monitor's current status.
Exits from the OSD main menu.
Display Info
(Shortcut Key 5)
Exit
details.
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Using the Navigation keys
When the OSD main menu is active, move the joystick to configure the settings,
following the navigation keys displayed below the OSD.
After you change the settings, press the joystick to save the changes before
proceeding to another menu or exit the OSD menu.
NOTE: To exit the current menu item and return to the previous menu,
move the joystick to the left until you exit.
Accessing the Menu System
Icon
Menu and
Submenus
Description
Brightness/
Contrast
Activates Brightness/Contrast adjustment.
Brightness
Adjusts the luminance of the backlight.
Toggle the joystick up to increase the brightness and
toggle the joystick down to decrease the brightness
(Range: 0 - 100).
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Contrast
Adjusts the Brightness first, and then adjust the
Contrast only if further adjustment is necessary.
Toggle the joystick up to increase the contrast and
toggle the joystick down to decrease the contrast
(Range: 0 - 100).
The Contrast function adjusts the degree of
difference between darkness and lightness on the
monitor screen.
Input Source
Selects between the different video signals that may
be connected to your monitor.
DP
Select the DP input when you are using the
DisplayPort (DP) connector. Press the joystick to
confirm the selection.
HDMI
Select the HDMI input when you are using the HDMI
connector. Press the joystick to confirm the
selection.
Auto Select
Allows you to scan for available input sources. The
default is On.
Rename Inputs Allows you to select the input name for the selected
input source. The options are PC, PC 1, PC 2,
Laptop, Laptop 1, and Laptop 2.
NOTE: Input names in warning messages and Display
Info will not be changed.
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Reset Input
Source
Press the joystick to reset all settings under the
Input Source menu to the factory preset values.
Color
Adjusts the color setting mode.
Preset Modes Allows you to choose from a list of preset color
modes.
• Standard: Default Color setting. This monitor
uses a low blue light panel, and is certified by TUV
to reduce blue light output and create a more
relaxing and less stimulating image while reading
content on the screen.
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• Movie: Ideal for movies.
• Game: Ideal for most gaming applications.
• Warm: Presents colors at lower color
temperatures. The screen appears warmer with a
red/yellow tint.
• Cool: Presents colors at higher color
temperatures. The screen appears cooler with a
blue tint.
• Custom Color: Allows you to manually adjust the
color settings.
Toggle the joystick up or down to adjust the RGB
color values and create your own preset color
mode.
Input Color
Format
Allows you to set the video input mode to:
• RGB: Select this option if your monitor is
connected to a computer or a media player that
supports RGB output.
• YCbCr: Select this option if your media player
supports only YCbCr output.
Press the joystick to confirm the selection.
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Hue
Shifts the color of the video image to green or
purple. This is used to adjust the desired flesh tone
color. Toggle the joystick up or down to adjust the
hue from '0' to '100'.
NOTE: Hue adjustment is available only when you
select Movie or Game preset mode.
Saturation
Adjusts the color saturation of the video image.
Toggle the joystick up or down to adjust the
saturation from '0' to '100'.
NOTE: Saturation adjustment is available only
when you select Movie or Game preset mode.
Reset Color
Display
Press the joystick to reset all settings under the
Color menu to the factory preset values.
Use the Display menu to adjust images.
Aspect Ratio
Sharpness
Adjusts the image ratio to 16:9, 4:3, or 5:4.
This feature can make the image look sharper or
softer.
Toggle the joystick up or down to adjust the
sharpness from '0' to '100'.
Response Time Allows you to set the Response Time to Normal or
Fast.
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MST
DP Multi Stream Transport, select On to enable MST
(DP Out), select Off to disable the MST function.
Transport (MST) Function for details.
NOTE: When DP upstream cable and DP
downstream cable are connected, the OSD will set
MST to On automatically. This action will only be
done once after Factory Reset or Display Reset.
Reset Display Press the joystick to reset all settings under the
Display menu to the factory preset values.
Audio &
Webcam
Allows you to adjust audio and webcam settings.
NOTE: For Webcam and Microphone to work,
connect the USB upstream cable from the PC to the
monitor.
Volume
Allows you to increase the speaker volume.
Move the joystick up and down to adjust the volume
from ‘0’ to ‘100’.
Speaker
Microphone
Webcam
Select to Mute or Unmute the Speaker.
Select to Mute or Unmute the Microphone.
Select to Enable or Disable the Webcam.
Audio Profiles Allows you to choose from a list of preset audio
profiles.
Standard: Default audio setting.
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• Voice: Load profile ideal for meetings.
• Movie: Load profile ideal for movies.
• Game: Load profile ideal for gaming.
• Music: Load profile ideal for listening to music.
Reset Audio & Press the joystick to reset all settings under the
Webcam
Menu
Audio & Webcam menu to the factory preset
values.
Select this option to adjust the settings of the OSD,
such as, the languages of the OSD, the amount of
time the menu remains on screen, and so on.
Language
Rotation
Sets the OSD display to one of the eight languages
(English, Spanish, French, German, Brazilian
Portuguese, Russian, Simplified Chinese, or
Japanese).
Press the joystick to rotate the OSD and the screen
by 0/90/180/270 degrees.
You can adjust the menu according to your display
rotation.
Transparency Select this option to change the menu transparency
by toggling the joystick up or down (Range: 0 - 100).
Timer
Sets the length of time the OSD will remain active
after the last time you pressed a button.
Toggle the joystick up or down to adjust the slider in
1 second increments, from 5 to 60 seconds.
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Lock
With the control buttons on the monitor locked, you
can prevent people from accessing the controls. It
also prevents accidental activation in multiple
monitors side-by-side setup.
• Menu Buttons: All joystick functions are locked
and not accessible by the user.
• Power Button: Only the Power Button is locked
and not accessible by the user.
• Menu + Power Buttons: Both the joystick & the
Power Button are locked and not accessible by
the user.
The default setting is Disable.
Alternative Lock Method [for Menu/function
buttons]: You can also press and hold the joystick to
the up or down or left or right for 4 seconds to set
the lock options.
NOTE: To unlock the button(s), press and hold the
joystick to the up or down or left or right for 4
seconds.
Reset Menu
Press the joystick to reset all settings under the
Menu menu to the factory preset values.
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Personalize
Shortcut Key 1
Shortcut Key 2
Allows you to choose a feature from Preset Modes,
Brightness/Contrast, Input Source, Aspect
Shortcut Key 3 Ratio, Volume, Speaker, Microphone, Webcam,
Rotation, or Display Info and set it as a shortcut
key.
Shortcut Key 4
Shortcut Key 5
Power Button Allows you to set the power LED indicator on or off
LED
to save energy.
USB
Allows you to enable or disable USB Type-A
Downstream Ports charging function during monitor
standby mode.
Reset
Press the joystick to reset all settings under the
Personalization Personalize menu to the factory preset values.
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Others
Select this option to adjust the OSD settings, such as
DDC/CI, LCD Conditioning, and so on.
Display Info
Press the joystick to display the monitor's current
settings.
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DDC/CI
DDC/CI (Display Data Channel/Command Interface)
allows your monitor parameters (brightness, color
balance, and etc.) to be adjustable via the software
on your computer. You can disable this feature by
selecting Off. Enable this feature for best user
experience and optimum performance of your
monitor.
LCD
Conditioning
Helps reduce minor cases of image retention.
Depending on the degree of image retention, the
program may take some time to run. You can enable
this feature by selecting On.
Firmware
Displays the firmware version of your monitor.
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Service Tag
Displays the service tag of your monitor. This string is
required when you look for phone support, check
your warranty status, update drivers on Dell's
website, etc.
Self-Diagnostic Press the joystick to initiate the self-diagnostic
process.
1. When initiated, a gray screen appears.
2. Carefully inspect the screen for abnormalities.
3. Press the joystick. The color of the screen
changes to red.
4. Inspect the display for any abnormalities.
5. Repeat steps 3 and 4 to inspect the display in
green, blue, black, white and text screens.
The test is complete when the text screen appears.
To exit, press the joystick again.
Reset Others Press the joystick to reset all settings under the
Others menu to the factory preset values.
Factory Reset Restore all preset values to the factory default
settings. These are also the settings for ENERGY
®
STAR tests.
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This means that the monitor cannot synchronize with the signal that it is
and Vertical frequency ranges addressable by this monitor. Recommended
mode is 1920 x 1080.
NOTE: The message may be slightly different according to the
connected input signal.
You will see the following message before the DDC/CI function is disabled:
When you adjust the Brightness level for the first time, the following message
appears:
NOTE: If Yes is selected, the message will not appear next time you
intend to change the Brightness setting.
When you change the default setting of power saving features for the first time,
such as USB, the following message appears:
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NOTE: If you select Yes for any one of the features mentioned above,
the message will not appear next time you intend to change the
settings of these features. When you perform a factory reset, the
message will appear again.
You will see the following message before the Lock function is activated:
NOTE: The message may be slightly different according to the selected
settings.
When the monitor goes into Standby mode, the following message appears:
NOTE: The message may be slightly different according to the
connected input signal.
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The OSD functions only in the normal operation mode. If you press any button other
than the Power Button during the Standby mode, the following message will
appear depending on the selected input:
NOTE: The message may be slightly different according to the
connected input signal.
NOTE: The message may be slightly different according to the
connected input signal.
If either DisplayPort or HDMI input is selected and the corresponding cable is not
connected, a dialog box as shown below appears.
or
NOTE: The message may be slightly different according to the
connected input signal.
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When Disable is selected for the Webcam, the following message appears:
When the Webcam is disabled and the webcam module pop up, the following
message appears:
NOTE: For Webcam and Microphone to work, connect the USB
upstream cable from the PC to the monitor.
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Setting the Maximum Resolution
To set the maximum resolution for the monitor:
®
®
®
In Windows 7, Windows 8, and Windows 8.1:
®
®
1. For Windows 8 and Windows 8.1 only, select the Desktop tile to switch to
classic desktop.
2. Right-click on the desktop and click Screen Resolution.
3. Click the dropdown list of the Screen Resolution and select 1920 x 1080.
4. Click OK.
®
In Windows 10:
1. Right-click on the desktop and click Display settings.
2. Click Advanced display settings.
3. Click the dropdown list of Resolution and select 1920 x 1080.
4. Click Apply.
If you do not see 1920 x 1080 as an option, you may need to update your graphics
driver. Depending on your computer, complete one of the following procedures:
If you have a Dell desktop or portable computer:
the latest driver for your graphics card.
If you are using a non-Dell computer (portable or desktop):
• Go to the support site for your computer and download the latest graphic
drivers.
• Go to your graphics card website and download the latest graphic drivers.
NOTE: The following OSD settings will be synchronized: Brightness,
Contrast, Preset Modes, Color Temp., Custom Color (RGB Gain), Hue
(Movie, Game mode), Saturation (Movie, Game mode), Response Time,
and Sharpness.
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Click Add under PIN and enter to Set up a PIN. Enter New PIN and Confirm PIN,
and then click OK.
Once you have done that, the options to set up Windows Hello will unlock. Click Set
up under Windows Hello, enter to Windows Hello setup.
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The following message is displayed, click Get started.
Keep looking directly at your screen and position yourself so that your face is in the
center of the frame that appears on screen. The webcam will then register your
face.
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When the following message is displayed, click Close to exit Windows Hello
setup.
Once you have set up, you have another option to improve the recognition. Click
Improve recognition if necessary.
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Setting Up the Monitor Webcam as Default Setting
When using a notebook with built-in webcam to connect this monitor, in the device
manager interface, you can find the notebook built-in webcam and the monitor
webcam. Normally, they are in enable status, and the default setting is using
notebook built-in webcam.
If you want to set up the monitor webcam as default setting, you need to disable
the notebook built-in webcam. To identify the notebook built-in webcam and disable
it, please follow below instruction:
Right-click DELL Monitor IR Webcam, and click Properties to open the DELL
Monitor IR Webcam Properties.
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Click Details > Property and select Hardware Ids.
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The Value will show the detail hardware ids of this DELL Monitor IR Webcam.
The hardware ids of the notebook built-in webcam and the monitor webcam are
different. For C2423H/C2723H, the monitor webcam hardware ids will show as
below:
Right-click the PC/Notebook webcam, which has different hardware ids, and then
click Disable.
The following message is displayed:
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Click Yes. The notebook webcam is now disabled and the monitor webcam will be
used as the default setting. Restart the notebook.
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Setting Up the Monitor Speaker as Default Setting
When your computer connects multiple speakers, if you want to setup the monitor
speaker as default setting, please follow below instructions:
Right-click Volume in the Windows task bar notification area.
Click Sounds to enter to Sound setting interface.
If only the HDMI or DP cable is connected from your monitor to the computer, only
one speaker named DELL C2423H/C2723H from the monitor will show in the
Sound setting interface.
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Click DELL C2423H/C2723H, and then click Set Default, the monitor speaker will
be used as the default setting.
Click OK to exit the Sound setting.
If the USB cable and the HDMI or DP cable are connected from the monitor to the
computer, two audio paths named DELL C2423H/C2723H and Echo Cancelling
Speakerphone (C2423H/C2723H) from the monitor will show in the Sound
setting interface. The DELL C2423H/C2723H monitor would show options for
two audio paths supported in the monitor.
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• Echo Cancelling Speakerphone (C2423H/C2723H) audio path is where
audio streams through USB. This is through USB-A to USB-B cable. As the
microphone path streams from monitor back to PC through USB, this
selection is required for VoIP/UC conference applications. Audio Recording
and Playback will work under this selection.
• DELL C2423H/C2723H audio path is where audio streams through HDMI/
DP. Under this selection, there will not be microphone support. This selection
is suitable for Audio Playback only.
Audio Playback performance would be the same for either audio path selection.
Under normal Playback with USB-A to USB-B and/or for UC conference
applications, default selecting the Echo Cancelling Speakerphone (C2423H/
C2723H) audio path is recommended.
NOTE: If you select DELL C2423H/C2723H audio path, please ensure
that the Echo Cancelling Speakerphone (C2423H/C2723H) volume is
set to medium or high. Else, the DELL C2423H/C2723H maximum
volume may sound soft because it is limited by the Echo Cancelling
Speakerphone (C2423H/C2723H) volume. For example, when the Echo
Cancelling Speakerphone (C2423H/C2723H) volume is at 50%, and the
DELL C2423H/C2723H volume is set to 100%, the DELL C2423H/
C2723H will have the same sound level as the former.
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Troubleshooting
WARNING: Before you begin any of the procedures in this section,
Self-test
Your monitor provides a self-test feature that allows you to check whether your
monitor is functioning properly. If your monitor and computer are properly
connected but the monitor screen remains dark, run the monitor self-test by
performing the following steps:
1. Turn off both your computer and the monitor.
2. Unplug the video cable from the back of the computer.
3. Turn on the monitor.
The floating dialog box should appear on-screen (against a black background), if the
monitor cannot sense a video signal and is working correctly. While in self-test
mode, the power LED remains white. Also, depending upon the selected input, one
of the dialogs shown below will continuously scroll through the screen.
or
NOTE: The message may be slightly different according to the
connected input signal.
4. This box also appears during normal system operation, if the video cable
becomes disconnected or damaged.
5. Turn Off your monitor and reconnect the video cable; then turn On both your
computer and the monitor.
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If your monitor screen remains blank after you use the previous procedure, check
your video controller and computer, because your monitor is functioning properly.
Using the Joystick to Lock/Unlock Buttons
Locking the Power and Joystick Buttons
You can lock the joystick and Power buttons to prevent access to the OSD menu
and/or power off the monitor.
To lock the buttons:
1. Toggle and hold the joystick to the up or down or left or right for about 4
seconds until a pop menu appears.
2. Select one of the following options:
• Menu Buttons: All joystick functions are locked and not accessible by the
user.
• Power Buttons: Only the Power Button is locked and not accessible by
the user.
• Menu + Power Buttons: Both the joystick & the Power Button are locked
and not accessible by the user.
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To unlock the button(s), press and hold the joystick to the up or down or left or
right for 4 seconds. Select the Unlock icon to unlock the button(s).
Updating Monitor Firmware
to the Dell download support site for the latest application installer (Monitor
Firmware Update Utility.exe) and refer to the Firmware Update Instruction
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Common Problems
The following table contains general information about common monitor problems
you might encounter and the possible solutions:
Common
What You
Possible Solutions
Symptoms
Experience
No Video/Power No picture
LED off
• Ensure that the video cable
connecting the monitor and the
computer is properly connected and
secure.
• Verify that the power outlet is
functioning properly using any other
electrical equipment.
• Ensure that the Power Button is
pressed fully.
• Ensure that the correct input source is
No Video/Power No picture or no
• Increase brightness & contrast
controls via OSD.
LED on
brightness
• Perform monitor self-test feature
check.
• Check for bent or broken pins in the
video cable connector.
• Run the built-in diagnostics.
• Ensure that the correct input source is
Poor Focus
Picture is fuzzy,
• Eliminate video extension cables.
blurry, or ghosting
• Reset the monitor to factory settings.
• Change the video resolution to the
correct aspect ratio.
Shaky/Jittery
Video
Wavy picture or
fine movement
• Reset the monitor to factory settings.
• Check environmental factors.
• Relocate the monitor and test in
another room.
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Missing Pixels
LCD screen has
spots
• Cycle power On-Off.
• Pixel that is permanently Off is a
natural defect that can occur in LCD
technology.
• For more information on Dell Monitor
Quality and Pixel Policy, see Dell
Stuck-on Pixels
LCD screen has
bright spots
• Cycle power On-Off.
• Pixel that is permanently off is a
natural defect that can occur in LCD
technology.
• For more information on Dell Monitor
Quality and Pixel Policy, see Dell
Brightness
Problems
Picture too dim or • Reset the monitor to factory settings.
too bright
• Adjust brightness & contrast controls
via OSD.
Geometric
Distortion
Screen not
centered correctly
• Reset the monitor to factory settings.
Horizontal/
Screen has one or • Reset the monitor to factory settings.
Vertical Lines
more lines
• Perform monitor self-test feature
check and determine if these lines are
also in self-test mode.
• Check for bent or broken pins in the
video cable connector.
• Run the built-in diagnostics.
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Synchronization
Problems
Screen is
scrambled or
appears torn
• Reset the monitor to factory settings.
• Perform monitor self-test feature
check to determine if the scrambled
screen appears in self-test mode.
• Check for bent or broken pins in the
video cable connector.
• Restart the computer in the safe
mode.
Safety Related
Issues
Visible signs of
smoke or sparks
• Do not perform any troubleshooting
steps.
• Contact Dell immediately.
Intermittent
Problems
Monitor
malfunctions on &
off
• Ensure that the video cable
connecting the monitor to the
computer is connected properly and is
secure.
• Reset the monitor to factory settings.
• Perform monitor self-test feature
check to determine if the intermittent
problem occurs in self-test mode.
Missing Color
Picture missing
color
• Perform monitor self-test feature
check.
• Ensure that the video cable
connecting the monitor to the
computer is connected properly and is
secure.
• Check for bent or broken pins in the
video cable connector.
Wrong Color
Picture color not
good
• Try different Preset Modes in Color
settings OSD. Adjust the R/G/B
value in Custom Color in Color
settings OSD.
• Change the Input Color Format to
RGB or YCbCr/YPbPr in the Color
settings OSD.
• Run the built-in diagnostics.
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Image retention
from a static
image left on the image displayed
monitor for a long appears on the
Faint shadow
from the static
• Set the screen to turn off after a few
minutes of screen idle time. These can
be adjusted in Windows Power
Options or Mac Energy Saver setting.
period of time
screen
• Alternatively, use a dynamically
changing screensaver.
Webcam/Mic
does not work
• USB cable not • Plug in the USB Cable (Type-A to
plug in or not
select the
correct USB
source
Type-B).
• Select the monitor Webcam/Mic as
the default in the PC side.
• Not set the
monitor
webcam/mic
as the default
device
Product Specific Problems
Common
What You
Possible Solutions
Symptoms
Experience
Screen image is too Image is centered on • Check the Aspect Ratio setting in
small
screen, but does not
fill entire viewing
area
the Display menu OSD.
• Reset the monitor to factory settings.
Cannot adjust the OSD does not
• Turn Off the monitor, unplug the
power cord, plug it back, and then
turn On the monitor.
monitor with the
joystick control on
the rear of the
monitor
appear on the screen
• Check whether the OSD menu is
locked. If yes, toggle and hold the
joystick to any direction for 4 seconds
to unlock (for more information, see
Lock).
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No Input Signal
No picture, the LED • Check the signal source. Ensure the
when user controls light is white
are pressed
computer is not in the standby mode
by moving the mouse or pressing any
key on the keyboard.
• Check whether the signal cable is
plugged in properly. Re-plug the
signal cable if necessary.
• Reset the computer or video player.
The picture does
not fill the entire
screen
The picture cannot • Due to different video formats
fill the height or
(aspect ratio) of DVDs, the monitor
may display in full screen.
width of the screen
• Run the built-in diagnostics.
No video at HDMI/ When connected to Unplug the HDMI/DisplayPort cable
some dongle/
DisplayPort port
from dongle/docking device, then plug
the docking Thunderbolt cable to the
notebook. Plug the HDMI/DisplayPort
cable 7 seconds later.
docking device at
the port, there is no
video when
unplugging/plugging
the Thunderbolt
cable from the
notebook
®
Monitor buttons
(Speaker mute/
Volume down/
Volume up/
Microphone mute)
not working with
Monitor buttons
(Speaker mute/
Volume down/
Volume up/
Microphone mute)
not working on
Use Microsoft Teams App to perform
the below tasks:
• Call Icon to accept / hang up call
• Volume down / Volume up
adjustment
®
®
• Mic mute / unmute
• Camera on / off
Microsoft Teams
App with Chrome OS
/ Ubuntu
Microsoft Teams
App
Video recording
not working
Video recording App • Windows 7 not supported
not working with Win
• Switch to Windows 10
7
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Headset with Mic Headset with Mic
Use UC App Mic icon to mute / unmute
(3.5 mm combo jack)
has no response
when pressing the
monitor mute /
(3.5 mm combo
jack) not working
with monitor mute
/ unmute button
unmute button while
using UC App
When press either When press either
Connect USB upstream (USB A to B)
cable
Volume down /
Volume down /
Volume up or Mute
button, LED not
blink
Volume up or Mute
button, LED not blink
when connected to
HDMI or DP only
Camera or Mic not Camera or Mic not Connect USB upstream (USB A to B)
working when
connected to HDMI
or DP only
working
cable
Microphone not
working or not
detected
Microphone not
working or not
detected on the
Voice recorder App
with Intel Gen 11th
CPU (Tiger Lake)
platform
• Disable Intel Smart Sound
Technology for USB Audio driver in
the Device Manager and re-boot the
PC
• Alternatively, download the latest
Audio Driver version for your
computer or notebook
• Unplug the 2-ring headphone from
the headphone jack. Plug in a 3-ring
headphone, or use the built-in
microphone
• Unplug the 2-ring microphone from
the headphone jack as this is not
supported. Use the built-in
microphone instead
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Troubleshooting
No sound can be No sound can be
• Disable Intel Smart Sound
Technology for USB Audio driver in
the Device Manager and re-boot the
PC
heard from recorded
video with Intel Gen
11th CPU (Tiger
heard from
recorded video
Lake) platform
• Alternatively, download the latest
Audio Driver version for your
computer or notebook
When pressing
either Volume
down / Volume up,
OSD volume bar
response is
When pressing either • Disable Intel Smart Sound
Volume down /
Volume up, OSD
volume bar response
is lagging/delayed
with monitor
Technology for USB Audio driver in
the Device Manager and re-boot the
PC
• Alternatively, download the latest
Audio Driver version for your
computer or notebook
lagging/delayed
connected to Intel
Gen 11th CPU (Tiger
Lake) platform
No sound coming No sound coming
• Ensure that you have set the default
playback device as Echo Cancelling
Speakerphone (C2423H/C2723H) or
DELL C2423H/C2723H on your
system.
from the speakers
when play audio/
video on your system
from the speakers
• Turn Off the monitor, unplug the
monitor power cord, replug it, and
then turn On the monitor.
• Reset the monitor to Factory
Settings.
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Speaker volume is Speaker volume is
• Increase the speaker volume of DELL
C2423H/C2723H to maximum in the
Sound setting interface.
low / sounds soft
when speaker option
is DELL C2423H/
C2723H in Sound
setting interface
low / sounds soft
• Press the Volume Up button to
increase the speaker volume of DELL
C2423H/C2723H.
• If you select DELL C2423H/C2723H
audio path, please ensure that the
Echo Cancelling Speakerphone
(C2423H/C2723H) volume is set to
medium or high. Else, the DELL
C2423H/C2723H maximum volume
may sound soft because it is limited
by the Echo Cancelling
Speakerphone (C2423H/C2723H)
volume. For example, when the Echo
Cancelling Speakerphone (C2423H/
C2723H) volume is at 50%, and the
DELL C2423H/C2723H volume is set
to 100%, the DELL C2423H/C2723H
will have the same sound level as the
former.
Webcam is not
detected
Webcam is not
detected in the
Windows Device
Manager
• Ensure that the USB upstream cable
is connected between the monitor
and the computer or notebook.
• Reconnect the USB upstream cable
to the computer or notebook.
Webcam cannot
connect / Webcam
disconnected
Could not detect
Monitor camera /
Could not switch
back to the PC
camera
• Reset the monitor to Factory
Settings.
• Turn Off the monitor, unplug the
monitor power cord, replug it, and
then turn On the monitor.
• Select the Monitor camera again in
the Camera / Video setting of your
UC conference application.
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Microphone is
muted
Microphone is muted • Ensure that the USB upstream cable
in the Windows
Device Manager
is connected between the monitor
and the computer or notebook.
• Reconnect the USB upstream cable
to the computer or notebook.
• Ensure that the microphone is
enabled / unmuted on the monitor. If
the microphone mute LED is lighting
up in static red (indicates microphone
muted), press the microphone button
to unmute the microphone.
• Ensure that the monitor’s microphone
is selected and enabled / unmuted on
the setting in the UC application.
Microphone
volume is low /
sounds soft
Microphone volume • Ensure that the Mute button’s LED is
is low / sounds soft
to the other
dark (Indicates microphone
unmuted).
participant when in
audio / video call
• Adjust the distance between the user
and the microphone. The user should
avoid sitting too far away from the
microphone. The most optimum
distance between the user and the
microphone is 70 cm.
• Ensure that the monitor’s microphone
is selected and enabled / unmuted on
the setting in the UC application.
• Increase the microphone volume in
the Sound setting interface at the PC
side / in the UC application.
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Front buttons do No response on the • Ensure that the USB upstream cable
UC application when
pressing the buttons
located on the front
bezel
not work
is connected from the PC to the
monitor.
• For some UC platforms /
applications, the Mute function works
by pressing the Mute button, but the
Mute Icon on the UC platform is not
sync (Icon shows unmute). For more
information, see Unified
Webcam image
looks over-exposed
Webcam image
shows over-exposed
background
• Adjust the environment lighting
condition. Ensure the monitor is setup
at a well lighted environment,
preferably under ceiling lights. The
user should avoid a dim / dark
background. The user should avoid
directly facing a window with bright
sunlight.
Webcam image
looks grainy / dark
Webcam image
appears grainy / dark
Adjust the environment lighting
condition. Ensure the monitor is setup at
a well lighted environment, preferably
under ceiling lights. The user should
avoid a dim environment.
Webcam image
looks blurry
Webcam image
appears blurry / not
clear
• Peel off the transparent protective
film which originally sticked on the
front of the webcam.
• If the protective film is already peeled
off, use a clean and slightly damp
cloth to wipe the surface of the front
webcam.
• Adjust the distance between the user
and the camera. The user should
avoid sitting too far away from the
camera. The most optimum distance
between the user and the camera is
70 cm.
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Troubleshooting
Time lag between When playing XBOX, • The monitor codec IC initialization
the show out time
between video and
audio has 3 ~ 5
second difference
while turning On
monitor power or
unplugging/plugging
HDMI cable.
video and audio
when playing
XBOX
time requires approximately 3 ~ 5
seconds. This is normal behavior.
• Wait for 3 ~ 5 seconds after turning
On monitor power or plugging-in the
HDMI cable before playing video on
XBOX.
Volume value or
speaker status is
not updated in
OSD
When increasing /
decreasing OSD
volume value or
mute / unmute
speaker, the adjusted
value is not updated
in OSD and front
panel button.
• Switch audio device configuration of
Windows to Echo Cancelling
Speakerphone (C2423H/C2723H).
• Clear all grayed-out device in your
computer’s Device Manager.
The Mute button Press on the Mute • Ensure that the USB upstream cable
is not working
button does not
mute and unmute
microphone when
using Microsoft
Teams
is connected from the PC to the
monitor.
• Ensure that the Teams account is
provisioned / setup as ‘Teams Only’
mode. The tenant administrator
should enable the account to ‘Teams
Only’ mode.
Webcam no image Webcam no image
when using Skype
Select ‘DELL Monitor RGB Webcam’ as
the camera in Skype Video Device
setting.
for Business (SfB)
Webcam being
occupied
Webcam being
Avoid running multiple conference
occupied and cannot softwares at the same time. While you
be used
are using ‘conference software A’, close
the other ‘conference software B’.
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Universal Serial Bus (USB) Specific Problems
Common
What You
Possible Solutions
Symptoms
Experience
USB interface is
not working
USB peripherals
are not working
• Check that your monitor is turned On.
• Reconnect the upstream cable to your
computer.
• Reconnect the USB peripherals
(downstream connector).
• Switch Off and then turn On the
monitor again.
• Reboot the computer.
• Some USB devices like external
portable HDD require higher electric
current; connect the device directly to
the computer system.
SuperSpeed USB 5 SuperSpeed USB 5 • Check that your computer is
Gbps (USB 3.2
Gen1) interface is Gen1) peripherals
Gbps (USB 3.2
SuperSpeed USB 5 Gbps (USB 3.2
Gen1)-capable.
slow
working slowly or
not working at all
• Some computers have USB 3.2, USB
2.0 and USB 1.1 ports. Ensure that the
correct USB port is used.
• Reconnect the upstream cable to your
computer.
• Reconnect the USB peripherals
(downstream connector).
• Reboot the computer.
Wireless USB
peripherals stop
working when a
Wireless USB
peripherals
responding slowly
• Increase the distance between the
USB 3.2 peripherals and the wireless
USB receiver.
USB 3.2 device is or only working as
• Position your wireless USB receiver as
close as possible to the wireless USB
peripherals.
plugged in
the distance
between itself and
its receiver
• Use a USB-extender cable to position
the wireless USB receiver as far away
as possible from the USB 3.2 port.
decreases
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Appendix
FCC Notices (U.S. only) and Other Regulatory Information
For FCC notices and other regulatory information, see the regulatory compliance
Contact Dell
For customers in the United States, call 800-WWW-DELL (800-999-3355).
NOTE: If you do not have an active Internet connection, you can find
contact information on your purchase invoice, packing slip, bill, or Dell
product catalog.
Dell provides several online and telephone-based support and service
options. Availability varies by country and product, and some services may
not be available in your area.
EU Product Database for Energy Label and Product
Information Sheet
Appendix
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