Dell Monitor
D2421H/D2721H/D2421DS
User’s Guide
Monitor Model: D2421H/D2721H/D2421DS
Regulatory Model: D2421Ho/D2721Ho/D2421DSo
Contents
About Your Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Package Contents . . . . . . . . . . . . . . . . . . . . . . 5
Product Features. . . . . . . . . . . . . . . . . . . . . . . 6
Identifying Parts and Controls. . . . . . . . . . . . . . . . 7
Monitor Specifications. . . . . . . . . . . . . . . . . . . 11
Plug and Play. . . . . . . . . . . . . . . . . . . . . . . . 23
LCD Monitor Quality & Pixel Policy . . . . . . . . . . . . 23
Setting Up the Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Connecting the stand . . . . . . . . . . . . . . . . . . . 24
Using the Tilt and Vertical Extension . . . . . . . . . . . 26
Rotating the Monitor. . . . . . . . . . . . . . . . . . . . 27
Connecting Your Monitor . . . . . . . . . . . . . . . . . 28
Removing the Monitor Stand . . . . . . . . . . . . . . . 29
Wall Mounting (Optional) . . . . . . . . . . . . . . . . . 31
Operating the Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Power On the Monitor . . . . . . . . . . . . . . . . . . . 32
Using the Front-Panel Controls . . . . . . . . . . . . . . 32
Using the OSD Lock function . . . . . . . . . . . . . . . 33
Using the On-Screen Display (OSD) Menu . . . . . . . . 33
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Common Problems. . . . . . . . . . . . . . . . . . . . . 41
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3
Product-Specific Problems . . . . . . . . . . . . . . . . 44
Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Safety Instructions. . . . . . . . . . . . . . . . . . . . . 45
Contact Dell . . . . . . . . . . . . . . . . . . . . . . . . 45
Setting Up Your Monitor . . . . . . . . . . . . . . . . . . 45
Setting Up Your Monitor . . . . . . . . . . . . . . . . . . 47
Maintenance Guidelines . . . . . . . . . . . . . . . . . . 49
4
│
About Your Monitor
Package Contents
Your monitor ships with all the components shown below. Ensure that you have received
NOTE: Some items may be optional and may not ship with your monitor. Some
features or media may not be available in certain countries.
Display
a
b
a. D2421DS
b. D2421H/D2721H
Stand Riser
a. D2421DS
b. D2421H
c. D2721H
a
b
c
Stand base
a. D2421DS
b. D2421H
a
b
c
c. D2721H
Screws x 2 (D2721H)
Power Cable
HDMI Cable
About Your Monitor
│
5
Quick Setup Guide
Safety and Regulatory
Information
Product Features
The Dell D2421H/D2721H/D2421DS flat-panel display has an active matrix, Thin-Film
Transistor (TFT), Liquid Crystal Display (LCD) Panel with LED backlight. The monitor
features include:
•
•
•
D2421H: 60.5 cm (23.8 in.) diagonal viewable image size, 1920 x 1080 resolution,
plus full-screen support for lower resolutions.
D2721H: 68.6 cm (27 in.) diagonal viewable image size, 1920 x 1080 resolution, plus
full-screen support for lower resolutions.
D2421DS: 60.5 cm (23.8 in.) diagonal viewable image size, 2560 x 1440 resolution,
full-screen support for lower resolutions.
•
•
Tilt adjustment capability.
Removable pedestal and Video Electronics Standards Association (VESA) 100 mm
mounting holes for flexible mounting solutions.
•
D2421H/D2721H: Digital connectivity with HDMI and Analog connectivity with
VGA.
•
•
•
•
•
•
•
D2421DS: Digital connectivity with DisplayPort and HDMI.
Height adjustment and pivot capability for D2421DS.
Plug and play capability if supported by your system.
On-Screen Display (OSD) adjustments for ease of set-up and screen optimization.
Security lock slot.
RoHS compliant.
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. TÜV-
certified ComfortView feature is designed to reduce the amount of blue light
emitted from the monitor to help optimize eye comfort.
•
•
Arsenic-free glass and Mercury-free for the panel only.
0.5 W standby power when in the sleep mode.
6
│
About Your Monitor
Identifying Parts and Controls
NOTE: The graphics are used for the purpose of illustration only. Appearance on
the computer may vary.
D2421H
Front view
1
2
3
Label Description
1
2
3
Power On/Off button
LED indicator
Back view
1
2
DELL
D2421H
DELL
D2421H
⏨Წᱴ⽰ಞ/Flat Panel Monitor
ශਭꢀModel No.: D2421H
䗉
ޛ ⭫Ⓠ/ Rating: ⏨Წᱴ⽰ಞ/Flat Panel Monitor
ශਭꢀModel No.: D2421H
䗉
ޛ ⭫Ⓠ/ Rating: 100-240V~ 50/60Hz 0.8A
100-240V~ 50/60Hz 0.8A
3
䙖൦ꢁѣളꢀ Made in China 䙖ᰛᵕꢀ Manufactured date: April 2020 䙖൦ꢁѣളꢀ Made in China 䙖ᰛᵕꢀ Manufactured date: April 2020 4
Back View with Monitor Stand
Label Description
Use
1
VESA mounting holes (100 mm)
Supports optional mounting of the monitor
using a VESA mount or arm.
2
Security lock slot
Secures monitor with security lock
(security lock not included).
About Your Monitor
│
7
3
4
Regulatory rating label with
Barcode serial number
Lists the regulatory approvals. Refer to
this label if you need to contact Dell for
technical support.
Stand release button
Release stand from monitor.
Bottom View
1
2 3 4
Label Description
Use
1
AC power connector To connect the monitor power cable.
2
HDMI connector
To connect your computer to the monitor using a HDMI
cable.
3
VGA connector
To connect your computer to the monitor using a VGA
cable.
4
Earphone connector
To connect your earphone
D2721H
Front view
1
2
3
Label Description
1
8
│
About Your Monitor
2
3
Power On/Off button
LED indicator
Back view
1
DELL
D2721H
2
3
DELL
D2721H
⏨Წᱴ⽰ಞ/Flat Panel Monitor
ශਭꢀModel No.: D2721H
䗉
ޛ ⭫Ⓠ/ Rating: ⏨Წᱴ⽰ಞ/Flat Panel Monitor
ශਭꢀModel No.: D2721H
䗉
ޛ ⭫Ⓠ/ Rating: 100-240V~ 50/60Hz 1.0A
100-240V~ 50/60Hz 1.0A
䙖൦ꢁѣളꢀ Made in China 䙖൦ꢁѣളꢀ Made in China 䙖ᰛᵕꢀ Manufactured date: April 2020 䙖ᰛᵕꢀ Manufactured date: April 2020 4
Back View with Monitor Stand
Label Description
Use
1
VESA mounting holes (100 mm)
Supports optional mounting of the monitor
using a VESA mount or arm.
2
3
Security lock slot
Secures monitor with security lock
(security lock not included).
Regulatory rating label with
Barcode serial number
Lists the regulatory approvals. Refer to
this label if you need to contact Dell for
technical support.
4
Stand release button
Release stand from monitor.
Bottom View
1
2 3
Label Description
Use
1
AC power connector To connect the monitor power cable.
About Your Monitor
│
9
2
3
HDMI connector
VGA connector
To connect your computer to the monitor using a HDMI
cable.
To connect your computer to the monitor using a VGA
cable.
D2421DS
Front view
1
2
3
Label Description
1
2
3
Power On/Off button
LED indicator
Back view
1
2
3
Back View with Monitor Stand
10
│
About Your Monitor
Label Description
Use
1
VESA mounting holes (100 mm)
Supports optional mounting of the monitor
using a VESA mount or arm.
2
3
Security lock slot
Secures monitor with security lock
(security lock not included).
Regulatory rating label with
Barcode serial number
Lists the regulatory approvals. Refer to
this label if you need to contact Dell for
technical support.
Bottom View
1
2
3
Label Description
Use
1
AC power connector To connect the monitor power cable.
2
HDMI connector
To connect your computer to the monitor using a HDMI
cable.
3
DP connector
To connect your computer to the monitor using a DP
cable.
Monitor Specifications
Flat-Panel Specifications
Model number
D2421H
Active matrix - TFT LCD
D2721H
Screen type
Panel type
Active matrix - TFT LCD
In-Plane Switching
Technology
In-Plane Switching
Technology
Viewable image
Diagonal
604.7 mm (23.8 in.)
527.04 mm (20.76 in.)
296.46 mm (11.67 in.)
686.0 mm (27 in.)
Horizontal Active Area
Vertical Active Area
Area
597.89 mm (23.54 in.)
336.31 mm (13.24 in.)
156246.27 mm² (242.27 in.²) 201076.91 mm² (311.67 in.²)
Pixel pitch
0.2745 x 0.2745 mm
0.3114 x 0.3114 mm
About Your Monitor
│
11
Pixel per inch (PPI)
92
81
Viewing angle
Horizontal
Vertical
178° (typical)
178° (typical)
178° (typical)
178° (typical)
Brightness
Contrast ratio
250 cd/m² (typical)
1000 to 1 (typical)
250 cd/m² (typical)
1000 to 1 (typical)
Faceplate coating
Anti-glare with hard-coating
3H hardness
Anti-glare with hard-coating
3H hardness
Backlight
White LED edgelight system
White LED edgelight system
Response Time
5 ms (gray to gray - fast
mode)
5 ms (gray to gray - fast
mode)
8 ms (gray to gray - normal
mode)
8 ms (gray to gray - normal
mode)
Color Depth
Color Gamut
16.7 mil colors
16.7 mil colors
72% NTSC(CIE 1931)
72% NTSC(CIE 1931)
and 83% NTSC(CIE 1976)
and 83% NTSC(CIE 1976)
Connectivity
1x VGA, 1x HDMI 1.4, 1x
1x VGA, 1x HDMI 1.4
Earphone (φ 3.5 mm)
Border width (edge of
monitor to active area) (Top)/22.26 mm (Bottom)
6.25 mm (Side)/6.24 mm
6.98 mm (Side)/6.98 mm
(Top)/20.90 mm (Bottom)
Adjustability
Height adjustable stand N/A
N/A
Tilt
-5° to 20°
N/A
-5° to 20°
N/A
Pivot
Security
Security lock slot (cable lock Security lock slot (cable lock
sold separately)
sold separately)
Model number
Screen type
Panel type
D2421DS
Active matrix - TFT LCD
In-Plane Switching Technology
Viewable image
Diagonal
604.5 mm (23.8 in.)
Horizontal Active Area
Vertical Active Area
Area
526.85 mm (20.74 in.)
296.35 mm (11.67 in.)
156132.00 mm² (242.03 in.²)
12
│
About Your Monitor
Pixel pitch
0.2058 x 0.2058 mm
123
Pixel per inch (PPI)
Viewing angle
Horizontal
Vertical
178° (typical)
178° (typical)
Brightness
300 cd/m² (typical)
Contrast ratio
1000 to 1 (typical)
Faceplate coating
Anti-glare with hard-coating 3H hardness
Backlight
White LED edgelight system
Response Time
5 ms (gray to gray - fast mode)
8 ms (gray to gray - normal mode)
Color Depth
Color Gamut
Connectivity
16.7 mil colors
99% sRGB(TYP)
3x HDMI 1.4, 1x DP 1.2
Border width (edge of
monitor to active area)
7.08 mm (Side)/7.02 mm (Top)/19.83 mm (Bottom)
Adjustability
Height adjustable stand 100 mm
Tilt
-3.5° to 21.5°
Pivot
Security
90° clockwise
Security lock slot (cable lock sold separately)
Resolution Specifications
Model number
D2421H/D2721H
D2421DS
Scan range
• Horizontal
• Vertical
30 kHz to 83 kHz (automatic)
50 Hz to 75 Hz (automatic)
30 kHz to 83 kHz (automatic)
50 Hz to 75 Hz (automatic)
Maximum preset
resolution
1920 x 1080 at 60 Hz
2560 x 1440 at 60 Hz
About Your Monitor
│
13
Video display
capabilities
( HDMI&DP
playback)
480i, 480p, 576i, 576p, 720p,
1080i, 1080p
480i, 480p, 576i, 576p, 720p,
1080i, 1080p
Preset Display Modes
The following table lists the preset modes for which Dell guarantees image size and
centering:
D2421H/D2721H
Horizontal
Frequency
(kHz)
Vertical
Frequency
(Hz)
Sync Polarity
(Horizontal/
Vertical)
Pixel Clock
(MHz)
Display Mode
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
31.5
31.5
37.5
37.9
46.9
48.4
60.0
67.5
64.0
80.0
60.0
67.5
70.1
59.9
75.0
60.3
75.0
60.0
75.0
75.0
60.0
75.0
60.0
60.0
28.3
25.2
31.5
-/+
-/-
-/-
40.0
49.5
65.0
78.8
+/+
+/+
-/-
+/+
+/+
+/+
+/+
+/+
+/+
108.0
108.0
135.0
108.0
148.5
D2421DS
Horizontal
Frequency
(kHz)
Vertical
Frequency
(Hz)
Sync Polarity
(Horizontal/
Vertical)
Pixel Clock
(MHz)
Display Mode
VESA, 720 x 400
VESA, 640 x 480
VESA, 640 x 480
31.5
31.5
37.5
70.1
59.9
75.0
28.3
25.2
31.5
-/+
-/-
-/-
14
│
About Your Monitor
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
VESA, 1920 x 1200
VESA, 2560 x 1440
37.9
46.9
48.4
60.0
67.5
64.0
80.0
60.0
67.5
74.0
88.8
60.3
75.0
60.0
75.0
75.0
60.0
75.0
60.0
60.0
60.0
60.0
40.0
49.5
+/+
+/+
-/-
65.0
78.8
+/+
+/+
+/+
+/+
+/+
+/+
+/+
+/-
108.0
108.0
135.0
108.0
148.5
154.0
241.5
Electrical Specifications
Model number
D2421H
Video input signals • Analog RGB: 0.7 V 5 %, 75 ohm input impedance
• HDMI 1.4 (HDCP 1.4), 150 mV=<Vp-p=<1560 mV for each
differential line, 100 ohm input impedance per differential pair
Synchronization
input signals
Separate horizontal and vertical synchronizations, polarity-free
TTL level, SOG (Composite SYNC on green)
AC input voltage / 100 VAC to 240 VAC / 50 Hz or 60 Hz 3 Hz / 0.8 A (typical)
frequency / current
Inrush current
120 V: 30 A (Max.)
240 V: 60 A (Max.)
Model number
D2721H
Video input signals • Analog RGB: 0.7 V 5 %, 75 ohm input impedance
• HDMI 1.4 (HDCP 1.4), 150 mV=<Vp-p=<1560 mV for each
differential line, 100 ohm input impedance per differential pair
Synchronization
input signals
Separate horizontal and vertical synchronizations, polarity-free
TTL level, SOG (Composite SYNC on green)
About Your Monitor
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15
AC input voltage / 100 VAC to 240 VAC / 50 Hz or 60 Hz 3 Hz / 1.0 A (typical)
frequency / current
Inrush current
120 V: 30 A (Max.)
240 V: 60 A (Max.)
Model number
D2421DS
Video input signals • HDMI 1.4 (HDCP 1.4), 150 mV=<Vp-p=<1560 mV for each
differential line, 100 ohm input impedance per differential pair
• DisplayPort 1.2 (HDCP 1.4), 120mV min.(For HBR) 50 mV min.
(For HBR2) for each differential line, 100 ohm input impedance
per differential pair
Synchronization
input signals
Separate horizontal and vertical synchronizations, polarity-free
TTL level, SOG (Composite SYNC on green)
AC input voltage / 100 VAC to 240 VAC / 50 Hz or 60 Hz 3 Hz / 0.8 A (typical)
frequency / current
Inrush current
120 V: 30 A (Max.)
240 V: 60 A (Max.)
Physical Characteristics
The following table lists the monitor’s physical characteristics:
Model number
D2421H
D2721H
Signal cable type
• Analog: D-Sub, 15 pins
• Digital: HDMI, 19 pins
• Analog: D-Sub, 15 pins
• Digital: HDMI, 19 pins
Dimensions: (with stand)
Height
393.7 mm (15.50 in.)
539.5 mm (21.24 in.)
176.9 mm (6.96 in.)
478.5 mm (18.84 in.)
611.8 mm (24.09 in.)
236.9 mm (9.33 in.)
Width
Depth
Dimensions: (without stand)
Height
325.3 mm (12.81 in.)
539.5 mm (21.24 in.)
40.8 mm (1.61 in.)
364.2 mm (14.34 in.)
611.8 mm (24.09 in.)
47.6 mm (1.87 in.)
Width
Depth
Stand dimensions:
Height
176.4 mm (6.94 in.)
199.9 mm (7.87 in.)
176.9 mm (6.96 in.)
186.9 mm (7.36 in.)
272.7 mm (10.74 in.)
236.9 mm (9.33 in.)
Width
Depth
16
│
About Your Monitor
Weight:
Weight with packaging
4.9 Kg (10.80 lb)
6.0 Kg (13.23 lb)
4.8 Kg (10.58 lb)
Weight with stand assembly 3.8 Kg (8.38 lb)
and cables
Weight without stand
3.2 Kg (7.05 lb)
4.0 Kg (8.82 lb)
0.5 Kg (1.10 lb)
assembly (For wall mount or
VESA mount considerations
- no cables)
0.3 Kg (0.66 lb)
Weight of stand assembly
Model number
D2421DS
Signal cable type
• Digital: DisplayPort, 20 pins
• Digital: HDMI, 19 pins
Dimensions: (with stand)
Height (extended)
Height (compressed)
Width
505.7 mm (19.91 in.)
405.7 mm (15.97 in.)
541.0 mm (21.30 in.)
211.6 mm (8.33 in.)
Depth
Dimensions: (without stand)
Height
323.2 mm (12.72 in.)
541.0 mm (21.30 in.)
44.9 mm (1.77 in.)
Width
Depth
Stand dimensions:
Height (extended)
Height (compressed)
Width
391.9 mm (15.43 in.)
347.22 mm (13.67 in.)
214.6 mm (8.45 in.)
Depth
211.6 mm (8.33 in.)
Base
214.6 mm x 211.6 mm (8.45 in. x 8.33 in.)
Weight:
Weight with packaging
7.0 Kg (15.43 lb)
5.9 Kg (13.01 lb)
Weight with stand assembly and cables
Weight without stand assembly (For wall
mount or VESA mount considerations - no 3.5 Kg (7.72 lb)
cables)
2.1 Kg (4.63 lb)
Weight of stand assembly
About Your Monitor
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17
Environmental Characteristics
Model number
Temperature
D2421H/D2721H/D2421DS
• Operating
0°C to 50°C (32°F to 122°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
20 % to 90 % (non-condensing)
• Operating
• Non-operating
Storage: 5 % to 90 % (non-condensing)
Shipping: 5 % to 90 % (non-condensing)
Altitude
5,000 m (16,404 ft) max
12,191 m (40,000 ft) max
• Operating
• Non-operating
Model number
D2421H
D2721H
D2421DS
Thermal dissipation
75.06 BTU/hour
(maximum)
95.53 BTU/hour
(maximum)
119.42 BTU/hour
(maximum)
68.24 BTU/hour
(typical)
85.3 BTU/hour
(typical)
102.36 BTU/hour
(typical)
Compliant standards
Model number
D2421H/D2721H/D2421DS
RoHS Compliant
yes
BFR/PVC free Monitor (excluding external cables) no
Power Management Modes
If you have VESA’s DPM compliance display card or software installed in your PC, the
monitor automatically reduces its power consumption when not in use. This is referred
to as Power Save Mode. If the computer detects input from keyboard, mouse, or other
input devices, the monitor automatically resumes functioning. The following table shows
the power consumption and signaling of this automatic power-saving feature:
D2421H
VESA Modes
Horizontal Vertical Video Power
Power Consumption
Sync
Sync
Indicator
Normal operation Active
Active
Active BLUE
22 W (maximum)**
20 W (typical)
18
│
About Your Monitor
Active-off mode Inactive
Switch off
Inactive Blank
ORANGE Less than 0.5 W
-
-
-
Off
Less than 0.5 W *
Power Consumption Pon
14.7 W
Total Energy Consumption (TEC) 45.7 kWh
D2721H
VESA Modes
Horizontal Vertical Video Power
Power Consumption
Sync
Sync
Indicator
Normal operation Active
Active
Active BLUE
28 W (maximum)**
25 W (typical)
Active-off mode Inactive
Inactive Blank
ORANGE Less than 0.5 W
Switch off
-
-
-
Off
Less than 0.5 W *
Power Consumption Pon
16.7 W
Total Energy Consumption (TEC) 52.0 kWh
D2421DS
VESA Modes
Horizontal Vertical Video Power
Power Consumption
Sync
Sync
Indicator
Normal operation Active
Active
Active BLUE
35 W (maximum)**
30 W (typical)
Active-off mode Inactive
Inactive Blank
ORANGE Less than 0.5 W
Off Less than 0.5 W *
Switch off
-
-
-
Power Consumption Pon
16.8 W
Total Energy Consumption (TEC) 52.2 kWh
NOTE:
Pon : Power consumption of On Mode measured with reference to Energy Star test method.
TEC : Total energy consumption in kWh measured with reference to Energy Star test method.
The OSD operates only in the normal operation mode. In the active-off mode, you only
could press button into Input Source.
* Zero-power consumption in OFF mode can only be achieved by disconnecting the main
cable from the monitor.
** Maximum power consumption with max luminance and contrast.
This document is informational only and reflects laboratory performance. Your product may
perform differently, depending on the software, components and peripherals you ordered
About Your Monitor
│
19
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.
Activate the computer and monitor to gain access to the OSD.
Pin Assignments
VGA connector
1
2
3
4
5
6
7
8
9
10
11 12 13 14 15
Pin number 15-pin side of the connected signal cable
1
2
Video-Red
Video-Green
Video-Blue
GND
3
4
5
Self-test
GND-R
6
7
GND-G
8
GND-B
9
DDC +5 V
GND-sync
GND
10
11
12
13
14
15
DDC data
H-sync
V-sync
DDC clock
20
│
About Your Monitor
HDMI connector
Pin number 19-pin Side of the Connected Signal Cable
1
TMDS DATA 2+
TMDS DATA 2 SHIELD
TMDS DATA 2-
2
3
4
TMDS DATA 1+
TMDS DATA 1 SHIELD
TMDS DATA 1-
5
6
7
TMDS DATA 0+
TMDS DATA 0 SHIELD
TMDS DATA 0-
TMDS CLOCK
8
9
10
11
12
13
14
15
16
17
18
19
TMDS CLOCK SHIELD
TMDS CLOCK-
No Connection
No Connection
DDC CLOCK (SCL)
DDC DATA (SDA)
GND
+5 V POWER
HOT PLUG DETECT
About Your Monitor
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21
DP connector
Pin number 20-pin side of the connected signal cable
1
2
ML_LANE3_N
GND
3
ML_LANE3_P
ML_LANE2_N
GND
4
5
6
ML_LANE2_P
ML_LANE1_N
GND
7
8
9
ML_LANE1_P
ML_LANE0_N
GND
10
11
12
13
14
15
16
17
18
19
20
ML_LANE0_P
GND
GND
AUX _CH_P
GND
AUX _CH_N
HPD
RETURN
DP_PWR
22
│
About Your Monitor
Plug and Play
You can install the monitor in any Plug and Play compatible system. The monitor
automatically provides the computer 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 changing the monitor settings,
see Operating the Monitor.
LCD Monitor Quality & 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 LCD Monitor Pixel Policy, see
About Your Monitor
│
23
Setting Up the Monitor
Connecting the stand
NOTE: The stand is not installed at the factory when shipped. (D2421H/D2721H)
NOTE: The stand is installed at the factory when shipped. (D2421DS)
NOTE: The graphics are used for the purpose of illustration only. Appearance on
the computer may vary.
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 attach the monitor stand:
D2421H
1. Assemble the stand riser to stand base.
a. Place the monitor stand base on a stable table top.
b. Slide the monitor stand body in the downward direction into the stand base
until it clicks into place.
2. Attach the stand assembly to the monitor:
a. Place the monitor on a soft cloth or cushion near the edge of desk.
b. Align the stand assembly bracket to the monitor groove.
c. Insert the bracket towards monitor until it locks in place.
24
│
Setting Up the Monitor
D2721H
1. Assemble the stand riser to stand base.
a. Place the monitor stand base on a stable table top.
b. Slide the monitor stand body in the downward direction into the stand base
until it clicks into place.
2. Attach the stand assembly to the monitor:
a. Place the monitor on a soft cloth or cushion near the edge of desk.
b. Align the stand assembly bracket to the monitor groove.
c. Use a screwdriver to fully tighten the two screws to the top of the stand.
D2421DS
1. Remove the monitor’s protective cover and place the monitor with its display side
facing downward.
2. Insert the stand base blocks fully into the stand slot.
3. Lift the screw handle and turn the screw clockwise.
4. After fully tightening the screw, fold the screw handle flat within the recess.
NOTE: Lift the monitor carefully to prevent it from slipping or falling.
Setting Up the Monitor
│
25
Using the Tilt and Vertical Extension
Tilt
With the stand assembly, you can tilt the monitor for the most comfortable viewing
angle.
D2421H
D2721H
5°
20°
5°
20°
D2421DS
3.5°
21.5°
26
│
Setting Up the Monitor
NOTE: The stand base is detached when the monitor is shipped from the
factory.
Vertical Extension
NOTE: The stand extends vertically up to 100 mm. The figure below illustrates
how to extend the stand vertically.
100mm
Rotating the Monitor
Before you rotate the monitor, your monitor should be fully vertically extended and fully
tilted up to avoid hitting the bottom edge of the monitor.
90°
Setting Up the Monitor
│
27
Connecting Your Monitor
WARNING: Before you begin any of the procedures in this section, follow the
NOTE: Do not connect all cables to the computer at the same time.
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: The graphics are used for the purpose of illustration only. Appearance on
the computer may vary.
To connect your monitor to the computer:
1. Turn off your computer and disconnect the power cable.
2. Connect the black VGA or HDMI or DP cable to the corresponding video port on the
back of your computer.
3. Connect the Earphone port.(D2421H)
Connecting VGA/HDMI Cable and Earphone
D2421H
VGA
HDMI
Connecting VGA/HDMI Cable
D2721H
28
│
Setting Up the Monitor
VGA
HDMI
Connecting HDMI/DP Cable
D2421DS
DP
HDMI
Removing the Monitor Stand
NOTE: To prevent scratches on the screen when removing the stand, ensure
that the monitor is placed on a soft and clean surface.
NOTE: The following procedure is applicable for the stand that shipped with
your monitor.
NOTE: The graphics are used for the purpose of illustration only. Appearance on
the computer may vary.
To remove the stand:
D2421H
1. Place the monitor panel on a soft cloth or cushion.
2. Use a long screwdriver to push the release latch located in a hole just above the stand.
3. Once the latch is released, remove the stand away from the monitor.
Setting Up the Monitor
│
29
4. Press the tenons inwardly and pull the base from stand to remove.
D2721H
1. Place the monitor panel on a soft cloth or cushion.
2. Use a screwdriver to loosen the two screws at the top of the stand, Use a long
screwdriver to push the release latch located in a hole just above the stand.
3. Once the latch is released, remove the stand away from the monitor.
4. Press the tenons inwardly and pull the base from stand to remove.
D2421DS
1. Place the monitor panel on a soft cloth or cushion.
2. Loosen the screw from the base.
3. Use a screwdriver to loosen the four screws at the back of the monitor.
4. Lift the stand up and away from the monitor.
30
│
Setting Up the Monitor
Wall Mounting (Optional)
DELL
D2421H
⏨Წᱴ⽰ಞ/Flat Panel Monitor
ශਭꢀModel No.: D2421H
䗉
ޛ ⭫Ⓠ/ Rating: 100-240V~ 50/60Hz 0.8A
䙖൦ꢁѣളꢀ Made in China 䙖ᰛᵕꢀ Manufactured date: April 2020 NOTE: (Screw dimension: M4 x 10 mm). Refer to the instructions that come with
the VESA-compatible base mounting kit.
1. Place the monitor panel on a soft cloth or cushion on a stable flat table.
2. Remove the stand.
3. Remove 4 screws from wall hanging hole. (D2421H/D2721H)
4. Attach the mounting bracket from the wall mounting kit to the LCD.
5. Mount the LCD on the wall by following the instructions that came with the base
mounting kit.
NOTE: For use only with UL-listed wallD-mount bracket with minimum weight/load
bearing capacity of 9.6 Kg (21.16 lb) for D2421H, 12.0 Kg (26.46 lb) for D2721H, 10.8 Kg
(23.81 lb) for D2421DS.
Setting Up the Monitor
│
31
Operating the Monitor
Power On the Monitor
Press the button to turn on the monitor.
Using the Front-Panel Controls
Use the keys on the front of the monitor to adjust the settings.
1
2
3
4 5
6
Front-Panel Button Description
Use this button to launch the on-screen display (OSD).
See Accessing the Menu System.
Use this button to go back to the main menu or exit the
OSD main menu.
1
Use this button to select the next item down the list or
decrease the setting value.
2
3
When not in OSD menu, directly enters Contrast/Brightness.
Use this button to select the next item up the list or increase
the setting value.
When not in OSD menu, directly enters Color Vision Mode.
Use this button to select the OSD menu.
When not in OSD menu, directly enters Input Source from a list
of VGA, HDMI, Auto (D2421H/D2721H).
4
When not in OSD menu, directly enters Input Source from a list
of HDMI1, HDMI2, HDMI3, DP, Auto (D2421DS).
32
│
Operating the Monitor
5
6
Use the Power button to turn the monitor On and Off.
/
The blue LED indicates the monitor is On and fully functional.
Using the OSD Lock function
Button
Description
OSD Lock, press 10 seconds to lock, repeat press 10 seconds to
unlock(when not in OSD menu)
+
Power Lock, press 10 seconds to lock, repeat press 10 seconds
to unlock(when not in OSD menu)
+
Using the On-Screen Display (OSD) Menu
Accessing the Menu System
NOTE: Any changes you make using the OSD menu are automatically saved if
you move to another OSD menu, exit the OSD menu, or wait for the OSD menu
to disappear.
Press the button to open the OSD menu and display the main menu.
Menu and
Submenus
Icon
Description
Auto Adjust
(D2421H/
D2721H)
Adjust the Horizontal Position, Vertical Position, Phase (Fine
Tune) and Clock (H. Size) of the screen.
NOTE: Only available for D-SUB input.
D2421H
D2721H
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Operating the Monitor
│
33
Contrast/
Brightness
Use the Contrast/Brightness menu to adjust the Contrast/
Brightness/DCR/ECO.
D2421H
D2721H
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Contrast
Adjust brightness first, and adjust contrast only if you need
further adjustment.
Press the key to increase contrast and press the key to
decrease contrast (min 0 ~ max 100).
Brightness
Brightness adjusts the luminance of the backlight(min 0 ~ max
100).
Press the button to decrease brightness.
Press the button to increase brightness.
DCR
ECO
To set DCR function on/off. If DCR on, brightness should be at
100 and should not be adjustable.
To control ECO function on/off. If ECO on, brightness should
be at 20 and should not be adjustable. DCR should not be
adjustable.
34
│
Operating the Monitor
Input Source
Use the Input Source menu to select between different video
signals that may be connected to your monitor.
D2421H
D2721H
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VGA
HDMI
DP
Select VGA input when you are using the analog (VGA)
connector. Push to select the VGA input source.
Select HDMI input when you are using the HDMI connector.
Push to select the HDMI input source.
/
/
Select DP input when you are using the DP connector. Push
to select the DP input source.
Select Auto to scan for available input signals.
/
Auto
Operating the Monitor
│
35
Audio Adjust
(only for
D2421H)
Use the Audio Settings menu to adjust the audio settings.
When input source is VGA, “Audio Adjust” option on “Main
Menu” can’t be selected.
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Volume
Push
/
to adjust the earphone output scale.
Mute
To set or reset the mute function.
Color Adjust
When you select Color Adjust, you can choose Cool, Normal,
Warm, ComfortView, User Color and Color Vision Mode from
the list.
D2421H
D2721H
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36
│
Operating the Monitor
Cool
Adds blue to screen image for cooler white.
Normal
Adds red to screen image for warmer white and richer
red.
Warm
Adds green to screen image for a darker color.
ComfortView Optimize eye comfort with a TÜV-certified flicker-free screen.
Decreases the level of blue light emitted from the screen to
make viewing more comfortable for your eyes.
NOTE: To reduce the risk of eye strain and neck/arm/back/
shoulders pain from using the monitor for long periods of
time,we suggest that you:
• Set the screen about 20~28 in. (50~70 cm) from your eyes.
• Blink frequently to moisten or lubricate your eyes.
• Take regular 20-minute breaks every two hours.
• Look away from your monitor and gaze at a distant object at
20 feet away for at least 20 seconds during the breaks.
• Perform stretches to relieve tension in the neck/arm/back/
shoulders during the breaks.
User Color
Individual adjustments for red (R), green (G), blue (B).
Each step will increase / decrease value by 1.
Provides an optimum display environment depending on
the contents displayed.To select Standard, Scenery, Game,
Cinema, Text mode. When it is not under Standard mode,
“Contrast/Brightness” option on “Main Menu” can’t be
selected.
Color Vision
Mode
Information
When you select Information, displays the data about Model
Name, Input Source, Resolution, H. Frequency, V. Frequency,
Pixel Clock, Service Tag.
Operating the Monitor
│
37
Manual Image When you select Manual Image Adjust, you can choose H./V.
Adjust
Position, Clock, Phase, Sharpness, Aspect Ratio and Response
Time from the list. (D2421H/D2721H)
D2421H
D2721H
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When you select Manual Image Adjust, you can choose
Sharpness, Aspect Ratio and Response Time from the list.
(D2421DS)
D2421DS
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H./V. Position To adjust the horizontal and vertical position of the video.
Clock
The Phase and Pixel Clock adjustments allow you to adjust
your monitor to your preference.
Phase
If satisfactory results are not obtained using the phase
adjustment, use the Clock (coarse) adjustment and then use
Phase (fine), again.
Sharpness
To select the picture sharpness of display.
Aspect Ratio
To adjusts the video mode between Full Screen or 4:3
Response
Time
Increase response time of panel. (Off/Normal/Fast)
38
│
Operating the Monitor
Setup Menu
When you select Setup Menu, you can choose Language
Select, OSD Position, OSD Time Out and OSD Background
from the list.
D2421H
D2721H
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Language
Set the OSD display to languages of English, Simplified
Chinese.
OSD Position Adjust the horizontal position of the OSD.
Adjust the vertical position of the OSD.
OSD Time Out To set the displaying time of OSD
OSD
Background
Allows the user to change the OSD Transparency from
0/20/40/60/80/100.
Factory Reset Restore all preset values to the factory default settings.
OSD Messages
Activate the computer and wake up the monitor to gain access to the OSD.
In the active-off mode, you only could press button into Input Source.
Operating the Monitor
│
39
If VGA or DP or HDMI cable is not connected, a floating dialog box as shown below
appears. The monitor will enter sleep mode, and the LED indicates color will be orange.
No Signal
40
│
Operating the Monitor
Troubleshooting
WARNING: Before you begin any of the procedures in this section, follow the
Common Problems
The following table contains general information about common monitor problems you
might encounter and the possible solutions.
Common Symptoms What You
Experience
Possible Solutions
No Video/Power LED No picture
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
depressed fully.
• Ensure that the correct input source is
button.
No Video/Power LED No picture or no
• Increase brightness & contrast controls
via OSD.
on
brightness
• Perform monitor self-test feature
check.
• Check for bent or broken pins in the
video cable connector.
• Ensure that the correct input source is
selected via the Input Source select
menu.
Poor Focus
Picture is fuzzy,
• Perform Auto Adjust via OSD.
blurry, or ghosting • Adjust the Phase and Pixel Clock
controls via OSD.
• Eliminate video extension cables.
• Change the video resolution to the
correct aspect ratio (16:9).
Troubleshooting
│
41
Shaky/Jittery Video
Wavy picture or fine • Perform Auto Adjust via OSD.
movement
• Adjust the Phase and Pixel Clock
controls via OSD.
• Reset the monitor to Factory Reset.
• Check environmental factors.
• Relocate the monitor and test in
another room.
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 Support
site at:
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 Support
site at:
Brightness Problems Picture too dim or
too bright
• Reset the monitor to Factory Reset.
• Auto Adjust via OSD.
• Adjust brightness & contrast controls
via OSD.
Geometric Distortion Screen not
• Reset the monitor to Factory Reset.
centered correctly • Auto Adjust via OSD.
• Adjust brightness & contrast controls
via OSD.
NOTE: When using ‘HDMI’, the
positioning adjustments are not
available.
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│
Troubleshooting
Horizontal/Vertical
Lines
Screen has one or
more lines
• Reset the monitor to Factory Reset.
• Perform Auto Adjust via OSD.
• Adjust Phase and Pixel Clock controls
via OSD.
• 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.
NOTE: When using ‘HDMI’, the Pixel
Clock and Phase adjustments are not
available.
Synchronization
Problems
Screen is scrambled • Reset the monitor to Factory Reset.
or appears torn
• Perform Auto Adjust via OSD.
• Adjust Phase and Pixel Clock controls
via OSD.
• 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
• Ensure that the video cable connecting
the monitor to the computer is
& off
connected properly and is secure.
• Reset the monitor to Factory Reset.
• 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.
Troubleshooting
│
43
Wrong Color
Picture color not
good
• Change the Color Vision Mode in the
Color Adjust OSD to Graphics or Video
depending on the application.
• Try different User Color in Color Adjust
OSD. Adjust R/G/B value in User Color
OSD if the Color Vision Mode is turned
off.
NOTE: When choosing HDMI mode, the Auto Adjust function is not available.
Product-Specific Problems
Specific Symptoms What You
Experience
Possible Solutions
Screen image is too
small
Image is centered
• Check the Aspect Ratio setting in the
Display OSD.
• Reset the monitor to Factory Reset.
on screen, but
does not fill entire
viewing area
Cannot adjust the
monitor with the
buttons on the front
panel
OSD does not
appear on the
screen
• Turn off the monitor, unplug the power
cord, plug back, and then turn on the
monitor.
• Check whether the OSD menu is
locked. If yes, press the button and
button for 10 seconds to unlock (for
more information, see Lock).
No Input Signal when No picture, the LED • Check the signal source. Ensure the
user controls are
pressed
light is blue. When
you press “up”,
“down” or “Menu”
computer is not in the power saving
mode by moving the mouse or pressing
any key on the keyboard.
key, the message “ • Check whether the signal cable is
No input signal” will
appear.
plugged in properly. Re-plug the signal
cable if necessary.
• Reset the computer or video player.
The picture does not The picture cannot • Due to different video formats (aspect
fill the entire screen
fill the height or
width of the screen
ratio) of DVDs, the monitor may display
in full screen.
44
│
Troubleshooting
Appendix
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.
For information on safety instructions, see the Product Information Guide(SERI).
Contact Dell
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.
To get online Monitor support content:
To contact Dell for sales, technical support, or customer service issues:
1. Go to www.dell.com/contactdell
2. Verify your country or region in the Choose A Country/Region drop-down menu at
the top-left corner of the page.
3. Click Contact Us next to the country dropdown.
4. Select the appropriate service or support link based on your need.
5. Choose the method of contacting Dell that is convenient for you.
Setting Up Your Monitor
D2421H/D2721H
Setting display resolution to 1920 x 1080
For best performance, set the display resolution to 1920 x 1080 pixels by performing the
following steps:
In Windows Vista, Windows 7, Windows 8 or Windows 8.1:
1. For Windows 8 or 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.
Appendix
│
45
4.Click OK.
In Windows 10:
1. Right-click on the desk top and click Display Settings.
2. Click Advanced Display Settings.
3. Click the drop-down menu under Resolution and select 1920 x 1080.
4. Click Apply.
If you do not see the recommended resolution as an option, you may need to update your
graphics driver. Use one of the following methods to update the graphics driver:
Dell computer
driver for your graphics card.
2. After installing the drivers for your graphics adapter, attempt to set the resolution
to 1920 x 1080 again.
NOTE: If you are unable to set the resolution to 1920 x 1080, please contact Dell to
inquire about a graphics adapter that supports these resolutions.
Non-Dell computer
In Windows Vista, Windows 7, Windows 8 or Windows 8.1:
1. For Windows 8 or Windows 8.1 only, select the Desktop tile to switch to classic
desktop.
2.Right-click on the desktop and click Personalization.
3. Click Change Display Settings.
4.Click Advanced Settings.
5. Identify your graphics controller supplier from the description at the top of the
window (e.g. NVIDIA, AMD, Intel etc.).
6. Refer to the graphic card provider website for updated driver (for example, www.
7. After installing the drivers for your graphics adapter, attempt to set the resolution
to 1920 x 1080 again.
In Windows 10:
1. Right-click on the desktop and click Display Settings.
2.Click Advanced display settings.
46
│
Appendix
3. Click Display adapter properties.
4.Identify your graphics controller supplier from the description at the top of the
window (e.g. NVIDIA, AMD, Intel etc.).
5. Refer to the graphic card provider website for updated driver (for example, www.
6. After installing the drivers for your graphics adapter, attempt to set the resolution
to 1920 x 1080 again.
NOTE: If you are unable to set the recommended resolution, please contact the
manufacturer of your computer or consider purchasing a graphics adapter that
supports the video resolution.
Setting Up Your Monitor
D2421DS
Setting display resolution to 2560 x 1440
For best performance, set the display resolution to 2560 x 1440 pixels by performing the
following steps:
In Windows Vista, Windows 7, Windows 8 or Windows 8.1:
1. For Windows 8 or 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 2560 x 1440.
4.Click OK.
In Windows 10:
1. Right-click on the desk top and click Display Settings.
2. Click Advanced Display Settings.
3. Click the drop-down menu under Resolution and select 2560 x 1440.
4. Click Apply.
If you do not see the recommended resolution as an option, you may need to update your
graphics driver. Use one of the following methods to update the graphics driver:
Appendix
│
47
Dell computer
driver for your graphics card.
2. After installing the drivers for your graphics adapter, attempt to set the resolution
to 2560 x 1440 again.
NOTE: If you are unable to set the resolution to 2560 x 1440, please contact Dell to
inquire about a graphics adapter that supports these resolutions.
Non-Dell computer
In Windows Vista, Windows 7, Windows 8 or Windows 8.1:
1. For Windows 8 or Windows 8.1 only, select the Desktop tile to switch to classic
desktop.
2.Right-click on the desktop and click Personalization.
3. Click Change Display Settings.
4.Click Advanced Settings.
5. Identify your graphics controller supplier from the description at the top of the
window (e.g. NVIDIA, AMD, Intel etc.).
6. Refer to the graphic card provider website for updated driver (for example, www.
7. After installing the drivers for your graphics adapter, attempt to set the resolution
to 2560 x 1440 again.
In Windows 10:
1. Right-click on the desktop and click Display Settings.
2.Click Advanced display settings.
3. Click Display adapter properties.
4.Identify your graphics controller supplier from the description at the top of the
window (e.g. NVIDIA, AMD, Intel etc.).
5. Refer to the graphic card provider website for updated driver (for example, www.
6. After installing the drivers for your graphics adapter, attempt to set the resolution
to 2560 x 1440 again.
NOTE: If you are unable to set the recommended resolution, please contact the
manufacturer of your computer or consider purchasing a graphics adapter that
supports the video resolution.
48
│
Appendix
Maintenance Guidelines
Caring for Your Monitor
CAUTION: Read and follow the safety instructions before cleaning the 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 while unpacking, cleaning, or
handling your monitor:
• To clean your antistatic screen, slightly dampen a soft, clean cloth with water. If
possible, use a special screen-cleaning tissue or solution suitable for the antistatic
coating. Do not use benzene, thinner, ammonia, abrasive cleaners, or compressed
air.
• Use a slightly dampened, warm cloth to clean the plastics. Avoid using detergent of
any kind as some detergents leave a milky film on the plastics.
• If you notice a white powder when you unpack your monitor, wipe it off with a
cloth. This white powder occurs during the shipping of the monitor.
• Handle your monitor with care as a darker-colored monitor may scratch 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 power off your monitor when not in use
Appendix
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49
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