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Dell Monitor
D2421H/D2721H/D2421DS
User’s Guide
Monitor Model: D2421H/D2721H/D2421DS
Regulatory Model: D2421Ho/D2721Ho/D2421DSo
NOTE: A NOTE indicates important information that helps you make better use of your computer.
CAUTION: A CAUTION indicates potential damage to hardware or loss of data if instructions are not followed.
WARNING: A WARNING indicates a potential for property damage, personal injury, or death.
Copyright © 2020 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners.
2020 – 04
Rev. A00
Contents
About Your Monitor . . . . . . . . . . . . . . . |
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Package Contents . . . . . . . . . . . . . . |
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Product Features |
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Identifying Parts and Controls |
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Monitor Specifications |
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Plug and Play |
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LCD Monitor Quality & Pixel Policy . . . . . . . . |
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Setting Up the Monitor . . . . . . . . . . . . . . |
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Connecting the stand . . . . . . . . . . . . |
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Using the Tilt and Vertical Extension . . . . . . . |
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Rotating the Monitor |
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Connecting Your Monitor . . . . . . . . . . . |
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Removing the Monitor Stand . . . . . . . . . . |
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Wall Mounting (Optional) . . . . . . . . . . . |
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Operating the Monitor . . . . . . . . . . . . . . |
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Power On the Monitor . . . . . . . . . . . . |
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Using the Front-Panel Controls . . . . . . . . . |
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Using the OSD Lock function . . . . . . . . . . |
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Using the On-Screen Display (OSD) Menu . . . . . |
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Troubleshooting . . . . . . . . . . . . . . . . . . 41 |
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Common Problems |
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│ 3
Product-Specific Problems . . |
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Appendix . . . . . . . . . . . . . . . . . . . . 45 |
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Safety Instructions |
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Contact Dell . . . . . . . . |
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Setting Up Your Monitor |
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Setting Up Your Monitor |
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Maintenance Guidelines . . . . |
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4 │
About Your Monitor
Package Contents
Your monitor ships with all the components shown below. Ensure that you have received all the components and Contact Dell if anything is missing.
NOTE: Some items may be optional and may not ship with your monitor. Some features or media may not be available in certain countries.
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Display |
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a. D2421DS |
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b. D2421H/D2721H |
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Stand Riser |
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a. D2421DS |
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b. D2421H |
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c. D2721H |
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Stand base |
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a. D2421DS |
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b. D2421H |
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c. D2721H |
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Screws x 2 (D2721H) |
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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. TÜVcertified 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
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Description |
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Function buttons (For more information, see Operating the Monitor) |
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Power On/Off button |
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LED indicator |
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Back view
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Back View with Monitor Stand |
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Description |
Use |
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VESA mounting holes (100 mm) |
Supports optional mounting of the monitor |
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using a VESA mount or arm. |
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Security lock slot |
Secures monitor with security lock |
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(security lock not included). |
About Your Monitor │ 7
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Regulatory rating label with |
Lists the regulatory approvals. Refer to |
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Barcode serial number |
this label if you need to contact Dell for |
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technical support. |
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Stand release button |
Release stand from monitor. |
Bottom View
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Description |
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Use |
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AC power connector |
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To connect the monitor power cable. |
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HDMI connector |
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To connect your computer to the monitor using a HDMI |
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cable. |
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VGA connector |
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To connect your computer to the monitor using a VGA |
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cable. |
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Earphone connector |
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To connect your earphone |
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D2721H
Front view
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Description |
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Function buttons (For more information, see Operating the Monitor) |
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8 │ About Your Monitor
2Power On/Off button
3LED indicator
Back view
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Back View with Monitor Stand |
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Description |
Use |
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VESA mounting holes (100 mm) |
Supports optional mounting of the monitor |
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using a VESA mount or arm. |
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Security lock slot |
Secures monitor with security lock |
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(security lock not included). |
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Regulatory rating label with |
Lists the regulatory approvals. Refer to |
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Barcode serial number |
this label if you need to contact Dell for |
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technical support. |
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Stand release button |
Release stand from monitor. |
Bottom View
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Description |
Use |
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AC power connector |
To connect the monitor power cable. |
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About Your Monitor │ 9
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HDMI connector |
To connect your computer to the monitor using a HDMI |
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cable. |
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VGA connector |
To connect your computer to the monitor using a VGA |
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cable. |
D2421DS
Front view
1 2 3
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Description |
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Function buttons (For more information, see Operating the Monitor) |
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Power On/Off button |
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LED indicator |
Back view
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Back View with Monitor Stand
10 │ About Your Monitor
Label |
Description |
Use |
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VESA mounting holes (100 mm) |
Supports optional mounting of the monitor |
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using a VESA mount or arm. |
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Security lock slot |
Secures monitor with security lock |
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(security lock not included). |
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Regulatory rating label with |
Lists the regulatory approvals. Refer to |
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Barcode serial number |
this label if you need to contact Dell for |
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technical support. |
Bottom View
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Label |
Description |
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Use |
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AC power connector |
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To connect the monitor power cable. |
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HDMI connector |
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To connect your computer to the monitor using a HDMI |
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cable. |
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DP connector |
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To connect your computer to the monitor using a DP |
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cable. |
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Monitor Specifications
Flat-Panel Specifications
Model number |
D2421H |
D2721H |
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Screen type |
Active matrix - TFT LCD |
Active matrix - TFT LCD |
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Panel type |
In-Plane Switching |
In-Plane Switching |
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Technology |
Technology |
Viewable image |
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Diagonal |
604.7 mm (23.8 in.) |
686.0 mm (27 in.) |
Horizontal Active Area |
527.04 mm (20.76 in.) |
597.89 mm (23.54 in.) |
Vertical Active Area |
296.46 mm (11.67 in.) |
336.31 mm (13.24 in.) |
Area |
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 |
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About Your Monitor │ 11
Pixel per inch (PPI) |
92 |
81 |
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Viewing angle |
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Horizontal |
178° (typical) |
178° (typical) |
Vertical |
178° (typical) |
178° (typical) |
Brightness |
250 cd/m² (typical) |
250 cd/m² (typical) |
Contrast ratio |
1000 to 1 (typical) |
1000 to 1 (typical) |
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Faceplate coating |
Anti-glare with hard-coating |
Anti-glare with hard-coating |
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3H hardness |
3H hardness |
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Backlight |
White LED edgelight system |
White LED edgelight system |
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Response Time |
5 ms (gray to gray - fast |
5 ms (gray to gray - fast |
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mode) |
mode) |
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8 ms (gray to gray - normal |
8 ms (gray to gray - normal |
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mode) |
mode) |
Color Depth |
16.7 mil colors |
16.7 mil colors |
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Color Gamut |
72% NTSC(CIE 1931) |
72% NTSC(CIE 1931) |
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and 83% NTSC(CIE 1976) |
and 83% NTSC(CIE 1976) |
Connectivity |
1x VGA, 1x HDMI 1.4, 1x |
1x VGA, 1x HDMI 1.4 |
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Earphone (φ 3.5 mm) |
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Border width (edge of |
6.25 mm (Side)/6.24 mm |
6.98 mm (Side)/6.98 mm |
monitor to active area) |
(Top)/22.26 mm (Bottom) |
(Top)/20.90 mm (Bottom) |
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Adjustability |
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Height adjustable stand |
N/A |
N/A |
Tilt |
-5° to 20° |
-5° to 20° |
Pivot |
N/A |
N/A |
Security |
Security lock slot (cable lock |
Security lock slot (cable lock |
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sold separately) |
sold separately) |
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Model number |
D2421DS |
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Screen type |
Active matrix - TFT LCD |
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Panel type |
In-Plane Switching Technology |
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Viewable image |
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Diagonal |
604.5 mm (23.8 in.) |
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Horizontal Active Area |
526.85 mm (20.74 in.) |
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Vertical Active Area |
296.35 mm (11.67 in.) |
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Area |
156132.00 mm² (242.03 in.²) |
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12 │ About Your Monitor
Pixel pitch |
0.2058 x 0.2058 mm |
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Pixel per inch (PPI) |
123 |
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Viewing angle |
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Horizontal |
178° (typical) |
Vertical |
178° (typical) |
Brightness |
300 cd/m² (typical) |
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Contrast ratio |
1000 to 1 (typical) |
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Faceplate coating |
Anti-glare with hard-coating 3H hardness |
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Backlight |
White LED edgelight system |
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Response Time |
5 ms (gray to gray - fast mode) |
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8 ms (gray to gray - normal mode) |
Color Depth |
16.7 mil colors |
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Color Gamut |
99% sRGB(TYP) |
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Connectivity |
3x HDMI 1.4, 1x DP 1.2 |
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Border width (edge of |
7.08 mm (Side)/7.02 mm (Top)/19.83 mm (Bottom) |
monitor to active area) |
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Adjustability |
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Height adjustable stand |
100 mm |
Tilt |
-3.5° to 21.5° |
Pivot |
90° clockwise |
Security |
Security lock slot (cable lock sold separately) |
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Resolution Specifications
Model number |
D2421H/D2721H |
D2421DS |
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Scan range |
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Horizontal |
30 kHz to 83 kHz (automatic) |
30 kHz to 83 kHz (automatic) |
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Vertical |
50 Hz to 75 Hz (automatic) |
50 Hz to 75 Hz (automatic) |
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Maximum preset |
1920 x 1080 at 60 Hz |
2560 x 1440 at 60 Hz |
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resolution |
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About Your Monitor │ 13
Video display |
480i, 480p, 576i, 576p, 720p, |
480i, 480p, 576i, 576p, 720p, |
capabilities |
1080i, 1080p |
1080i, 1080p |
( HDMI&DP |
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playback) |
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Preset Display Modes
The following table lists the preset modes for which Dell guarantees image size and centering:
D2421H/D2721H
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Horizontal |
Vertical |
Pixel Clock |
Sync Polarity |
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Display Mode |
Frequency |
Frequency |
(Horizontal/ |
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(kHz) |
(Hz) |
Vertical) |
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VESA, 720 x 400 |
31.5 |
70.1 |
28.3 |
-/+ |
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VESA, 640 x 480 |
31.5 |
59.9 |
25.2 |
-/- |
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VESA, 640 x 480 |
37.5 |
75.0 |
31.5 |
-/- |
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VESA, 800 x 600 |
37.9 |
60.3 |
40.0 |
+/+ |
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VESA, 800 x 600 |
46.9 |
75.0 |
49.5 |
+/+ |
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VESA, 1024 x 768 |
48.4 |
60.0 |
65.0 |
-/- |
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VESA, 1024 x 768 |
60.0 |
75.0 |
78.8 |
+/+ |
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VESA, 1152 x 864 |
67.5 |
75.0 |
108.0 |
+/+ |
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VESA, 1280 x 1024 |
64.0 |
60.0 |
108.0 |
+/+ |
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VESA, 1280 x 1024 |
80.0 |
75.0 |
135.0 |
+/+ |
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VESA, 1600 x 900 |
60.0 |
60.0 |
108.0 |
+/+ |
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VESA, 1920 x 1080 |
67.5 |
60.0 |
148.5 |
+/+ |
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D2421DS
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Horizontal |
Vertical |
Pixel Clock |
Sync Polarity |
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Display Mode |
Frequency |
Frequency |
(Horizontal/ |
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(kHz) |
(Hz) |
Vertical) |
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VESA, 720 x 400 |
31.5 |
70.1 |
28.3 |
-/+ |
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VESA, 640 x 480 |
31.5 |
59.9 |
25.2 |
-/- |
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VESA, 640 x 480 |
37.5 |
75.0 |
31.5 |
-/- |
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14 │ About Your Monitor
VESA, 800 x 600 |
37.9 |
60.3 |
40.0 |
+/+ |
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VESA, 800 x 600 |
46.9 |
75.0 |
49.5 |
+/+ |
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VESA, 1024 x 768 |
48.4 |
60.0 |
65.0 |
-/- |
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VESA, 1024 x 768 |
60.0 |
75.0 |
78.8 |
+/+ |
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VESA, 1152 x 864 |
67.5 |
75.0 |
108.0 |
+/+ |
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VESA, 1280 x 1024 |
64.0 |
60.0 |
108.0 |
+/+ |
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VESA, 1280 x 1024 |
80.0 |
75.0 |
135.0 |
+/+ |
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VESA, 1600 x 900 |
60.0 |
60.0 |
108.0 |
+/+ |
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VESA, 1920 x 1080 |
67.5 |
60.0 |
148.5 |
+/+ |
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VESA, 1920 x 1200 |
74.0 |
60.0 |
154.0 |
+/+ |
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VESA, 2560 x 1440 |
88.8 |
60.0 |
241.5 |
+/- |
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Electrical Specifications
Model number |
D2421H |
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Video input signals |
• Analog RGB: 0.7 V ± 5 %, 75 ohm input impedance |
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• HDMI 1.4 (HDCP 1.4), 150 mV=<Vp-p=<1560 mV for each |
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differential line, 100 ohm input impedance per differential pair |
Synchronization |
Separate horizontal and vertical synchronizations, polarity-free |
input signals |
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 |
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Inrush current |
120 V: 30 A (Max.) |
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240 V: 60 A (Max.) |
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Model number |
D2721H |
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Video input signals |
• Analog RGB: 0.7 V ± 5 %, 75 ohm input impedance |
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• HDMI 1.4 (HDCP 1.4), 150 mV=<Vp-p=<1560 mV for each |
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differential line, 100 ohm input impedance per differential pair |
Synchronization |
Separate horizontal and vertical synchronizations, polarity-free |
input signals |
TTL level, SOG (Composite SYNC on green) |
About Your Monitor │ 15
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