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.
Contents About Your Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Package Contents . . . . . . . . . . . . . . . . . . . . . . 5 Product Features . . . . . . . . . . . . . . . . . . . . . . 6 Identifying Parts and Controls . . . . . . . . . . . . . . . 7 Monitor Specifications . . . . . . . . . . . . . . . . . . . 11 Plug and Play . . . . . . . . . . . . . . . . . . . . . . .
Product-Specific Problems . . . . . . . . . . . . . . . . 44 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Safety Instructions . . . . . . . . . . . . . . . . . . . . . 45 Contact Dell . . . . . . . . . . . . . . . . . . . . . . . . 45 Setting Up Your Monitor . . . . . . . . . . . . . . . . . . 45 Setting Up Your Monitor . . . . . . . . . . . . . . . . . .
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. Display a b a. D2421DS b. D2421H/D2721H a b c Stand Riser a. D2421DS b. D2421H c. D2721H a b c Stand base a. D2421DS b. D2421H c.
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.
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 Label 1 2 3 2 3 Description Function buttons (For more information, see Operating the Monitor) Power On/Off button LED indicator Back view 1 2 DELL D2421H ⏨Წᱴ⽰ಞ/Flat Panel Monitor ශਭ Model No.: D2421H 䗉⭫ޛⓆ/ Rating: 100-240V~ 50/60Hz 0.8A DELL D2421H ⏨Წᱴ⽰ಞ/Flat Panel Monitor ශਭ Model No.
3 Regulatory rating label with Barcode serial number 4 Stand release button Lists the regulatory approvals. Refer to this label if you need to contact Dell for technical support. Release stand from monitor. Bottom View 1 Label Description 1 AC power connector 2 HDMI connector 3 VGA connector 4 Earphone connector 2 3 4 Use To connect the monitor power cable. To connect your computer to the monitor using a HDMI cable. To connect your computer to the monitor using a VGA cable.
2 3 Power On/Off button LED indicator Back view 1 DELL D2721H ⏨Წᱴ⽰ಞ/Flat Panel Monitor ශਭ Model No.: D2721H 䗉⭫ޛⓆ/ Rating: 100-240V~ 50/60Hz 1.0A DELL D2721H ⏨Წᱴ⽰ಞ/Flat Panel Monitor ශਭ Model No.: D2721H 䗉⭫ޛⓆ/ Rating: 100-240V~ 50/60Hz 1.
2 HDMI connector 3 VGA connector To connect your computer to the monitor using a HDMI cable. To connect your computer to the monitor using a VGA cable.
Label Description 1 VESA mounting holes (100 mm) 2 Security lock slot 3 Regulatory rating label with Barcode serial number Use Supports optional mounting of the monitor using a VESA mount or arm. Secures monitor with security lock (security lock not included). Lists the regulatory approvals. Refer to this label if you need to contact Dell for technical support. Bottom View 1 Label Description 1 AC power connector 2 HDMI connector 3 DP connector 2 3 Use To connect the monitor power cable.
Pixel per inch (PPI) 92 81 Horizontal 178° (typical) 178° (typical) Vertical Brightness Contrast ratio 178° (typical) 250 cd/m² (typical) 1000 to 1 (typical) 178° (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) 8 ms (gray to gray - normal mode) 16.
Pixel pitch 0.2058 x 0.2058 mm Pixel per inch (PPI) 123 Viewing angle Horizontal 178° (typical) Vertical Brightness 178° (typical) 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 Color Depth 5 ms (gray to gray - fast mode) 8 ms (gray to gray - normal mode) 16.7 mil colors Color Gamut 99% sRGB(TYP) Connectivity 3x HDMI 1.4, 1x DP 1.
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) Pixel Clock (MHz) Sync Polarity (Horizontal/ Vertical) VESA, 720 x 400 31.5 70.1 28.3 -/+ VESA, 640 x 480 31.5 59.9 25.2 -/- VESA, 640 x 480 37.5 75.0 31.
VESA, 800 x 600 37.9 60.3 40.0 +/+ VESA, 800 x 600 46.9 75.0 49.5 +/+ VESA, 1024 x 768 48.4 60.0 65.0 -/- VESA, 1024 x 768 60.0 75.0 78.8 +/+ VESA, 1152 x 864 67.5 75.0 108.0 +/+ VESA, 1280 x 1024 64.0 60.0 108.0 +/+ VESA, 1280 x 1024 80.0 75.0 135.0 +/+ VESA, 1600 x 900 60.0 60.0 108.0 +/+ VESA, 1920 x 1080 67.5 60.0 148.5 +/+ VESA, 1920 x 1200 74.0 60.0 154.0 +/+ VESA, 2560 x 1440 88.8 60.0 241.
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=
Weight: Weight with packaging 4.9 Kg (10.80 lb) 6.0 Kg (13.23 lb) Weight with stand assembly 3.8 Kg (8.38 lb) and cables 4.8 Kg (10.58 lb) Weight without stand 3.2 Kg (7.05 lb) assembly (For wall mount or VESA mount considerations - no cables) 0.3 Kg (0.66 lb) Weight of stand assembly 4.0 Kg (8.82 lb) 0.5 Kg (1.10 lb) Model number D2421DS Signal cable type • Digital: DisplayPort, 20 pins • Digital: HDMI, 19 pins Dimensions: (with stand) Height (extended) 505.7 mm (19.91 in.
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 • Operating 20 % to 90 % (non-condensing) • Non-operating Storage: 5 % to 90 % (non-condensing) Shipping: 5 % to 90 % (non-condensing) Altitude • Operating 5,000 m (16,404 ft) max • Non-operating 12,191 m (40,000 ft) max Model number Thermal dissipation D2421H 75.
Active-off mode Switch off Inactive - Inactive - Blank - ORANGE Off Less than 0.5 W Less than 0.5 W * Video Power Indicator Power Consumption 28 W (maximum)** 25 W (typical) Less than 0.5 W Less than 0.5 W * Power Consumption Pon 14.7 W Total Energy Consumption (TEC) 45.7 kWh D2721H VESA Modes Horizontal Vertical Sync Sync Normal operation Active Active Active BLUE Active-off mode Switch off Inactive - Blank - ORANGE Off Inactive - Power Consumption Pon 16.
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.
HDMI connector Pin number 19-pin Side of the Connected Signal Cable 1 TMDS DATA 2+ 2 TMDS DATA 2 SHIELD 3 TMDS DATA 2- 4 TMDS DATA 1+ 5 TMDS DATA 1 SHIELD 6 TMDS DATA 1- 7 TMDS DATA 0+ 8 TMDS DATA 0 SHIELD 9 TMDS DATA 0- 10 TMDS CLOCK 11 TMDS CLOCK SHIELD 12 TMDS CLOCK- 13 No Connection 14 No Connection 15 DDC CLOCK (SCL) 16 DDC DATA (SDA) 17 GND 18 +5 V POWER 19 HOT PLUG DETECT About Your Monitor │ 21
DP connector Pin number 20-pin side of the connected signal cable 1 ML_LANE3_N 2 GND 3 ML_LANE3_P 4 ML_LANE2_N 5 GND 6 ML_LANE2_P 7 ML_LANE1_N 8 GND 9 ML_LANE1_P 10 ML_LANE0_N 11 GND 12 ML_LANE0_P 13 GND 14 GND 15 AUX _CH_P 16 GND 17 AUX _CH_N 18 HPD 19 RETURN 20 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.
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.
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.
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° 5° 20° D2421DS 3.5° 26 │ Setting Up the Monitor 21.
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.
Connecting Your Monitor WARNING: Before you begin any of the procedures in this section, follow the "Safety Instructions". 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.
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.
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.
Wall Mounting (Optional) DELL D2421H ⏨Წᱴ⽰ಞ/Flat Panel Monitor ශਭ Model No.: D2421H 䗉⭫ޛⓆ/ Rating: 100-240V~ 50/60Hz 0.8A 䙖൦ ѣള Made in China 䙖ᰛᵕ 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.
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). 1 2 3 See Accessing the Menu System. Use this button to go back to the main menu or exit the OSD main menu. Use this button to select the next item down the list or decrease the setting value.
5 Use the Power button to turn the monitor On and Off. / 6 The blue LED indicates the monitor is On and fully functional.
Contrast/ Brightness Use the Contrast/Brightness menu to adjust the Contrast/ Brightness/DCR/ECO.
Input Source Use the Input Source menu to select between different video signals that may be connected to your monitor. D2421H I n p u t D2721H S o u r c e I n p u t V G A H D M I A u t o S o u r c e V G A H D M I A u t o 1 : E x i t 1 : E x i t D2421DS I n p u t H H H D A S o u r c e D M I 1 D M I 2 D M I 3 P u t o 1 : E x i t VGA HDMI DP Auto Select VGA input when you are using the analog (VGA) connector. Push / to select the VGA input source.
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. A u d i o A d j u s t V o l u m e 5 0 M u t e 1 : E x i t S e l e c t : 2 Volume Push 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. / to adjust the earphone output scale.
Cool Adds blue to screen image for cooler white. Normal Adds red to screen image for warmer white and richer red. Adds green to screen image for a darker color. Warm 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.
Manual Image Adjust When you select Manual Image Adjust, you can choose H./V. Position, Clock, Phase, Sharpness, Aspect Ratio and Response Time from the list. (D2421H/D2721H) D2421H M a n u a l H C P S A R D2721H I m a g e M a n u a l A d j u s t H C P S A R . / V . P o s i t i o n l o c k h a s e h a r p n e s s s p e c t R a t i o e s p o n s e T i m e 1 : E x i t S e l e c t : 2 1 : E x i t I m a g e A d j u s t . / V .
Setup Menu When you select Setup Menu, you can choose Language Select, OSD Position, OSD Time Out and OSD Background from the list.
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 See Troubleshooting for more information.
Troubleshooting WARNING: Before you begin any of the procedures in this section, follow the Safety Instructions Common Problems The following table contains general information about common monitor problems you might encounter and the possible solutions.
Shaky/Jittery Video Missing Pixels Stuck-on Pixels Brightness Problems Geometric Distortion 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. • Cycle power on-off. LCD screen has • Pixel that is permanently off is a spots natural defect that can occur in LCD technology.
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 Screen is scrambled • Reset the monitor to Factory Reset.
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.
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.
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 1. Go to www.dell.com/support, enter your service tag, and download the latest driver for your graphics card. 2.
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. AMD.com or www.NVIDIA.com). 6. After installing the drivers for your graphics adapter, attempt to set the resolution to 1920 x 1080 again.
Dell computer 1. Go to www.dell.com/support, enter your service tag, and download the latest 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.
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.
