Dell D2421DS User Manual Download

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Troubleshooting

│

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.

Common Symptoms What You

Experience

Possible Solutions

No Video/Power LED
off

No picture

• 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

selected via the

Input Source

select

button.

No Video/Power LED
on

No picture or no
brightness

• Increase brightness & contrast controls

via OSD.

• 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,
blurry, or ghosting

• Perform Auto Adjust via OSD.
• Adjust the Phase and Pixel Clock

controls via OSD.

• Eliminate video extension cables.
• Reset the monitor to

Factory Reset

• Change the video resolution to the

correct aspect ratio (16:9).

Summary of Contents for D2421DS

Page 1: ...Monitor Model D2421H D2721H D2421DS Regulatory Model D2421Ho D2721Ho D2421DSo Dell Monitor D2421H D2721H D2421DS User s Guide ...

Page 2: ...demarks may be trademarks of their respective owners 2020 04 Rev A00 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 ...

Page 3: ...tting 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 ...

Page 4: ...4 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 ...

Page 5: ...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 D2421DS b D2421H D2721H Stand Riser a D2421DS b D2421H c D2721H Stand base a D2421DS b D2421H c D2721H Screws x 2 D2721H Power Cable HDMI Cable a a b b c b c a ...

Page 6: ...ty 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 ...

Page 7: ...at 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 DELL D2421H April 2020 Წᱴ 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 DELL D2421H April 2020 1 4 2 3 Back View with Monitor Stand Label Description Use 1 VESA mounting holes 100 mm Supports optional mounting of the...

Page 8: ...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 Function buttons For more information see Operati...

Page 9: ...2721H April 2020 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 3 Regulatory rating label with Barcode serial number Lists the regulatory approvals Refer to this label if you need to contact Dell for technical suppor...

Page 10: ...ing a HDMI cable 3 VGA connector To connect your computer to the monitor using a VGA cable D2421DS Front view 1 2 3 Label Description 1 Function buttons For more information see Operating the Monitor 2 Power On Off button 3 LED indicator Back view 1 2 3 Back View with Monitor Stand ...

Page 11: ...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 D2721H Screen type Active matrix TFT LCD Active matrix TFT LCD Panel type In Plane Switching Technology In Plane Switching Technology Viewable image Diagonal H...

Page 12: ...l colors 16 7 mil colors Color Gamut 72 NTSC CIE 1931 and 83 NTSC CIE 1976 72 NTSC CIE 1931 and 83 NTSC CIE 1976 Connectivity 1x VGA 1x HDMI 1 4 1x Earphone φ 3 5 mm 1x VGA 1x HDMI 1 4 Border width edge of monitor to active area 6 25 mm Side 6 24 mm Top 22 26 mm Bottom 6 98 mm Side 6 98 mm Top 20 90 mm Bottom Adjustability Height adjustable stand Tilt Pivot N A 5 to 20 N A N A 5 to 20 N A Security...

Page 13: ...or Depth 16 7 mil colors Color Gamut 99 sRGB TYP Connectivity 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 Tilt Pivot 100 mm 3 5 to 21 5 90 clockwise Security Security lock slot cable lock sold separately Resolution Specifications Model number D2421H D2721H D2421DS Scan range Horizontal Vertical 30 ...

Page 14: ...ESA 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 5 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 D2421DS Display Mode Horiz...

Page 15: ...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 frequency current 100 VAC to 240 VAC 50 Hz or 60 Hz 3 Hz 0 8 A typical Inrush current 120 V 30 A Max 240 V 60 A Max Model number D2721H Video input s...

Page 16: ...put voltage frequency current 100 VAC to 240 VAC 50 Hz or 60 Hz 3 Hz 0 8 A typical 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 Width Depth 393 7 mm 15 ...

Page 17: ...nd Height extended Height compressed Width Depth 505 7 mm 19 91 in 405 7 mm 15 97 in 541 0 mm 21 30 in 211 6 mm 8 33 in Dimensions without stand Height Width Depth 323 2 mm 12 72 in 541 0 mm 21 30 in 44 9 mm 1 77 in Stand dimensions Height extended Height compressed Width Depth Base 391 9 mm 15 43 in 347 22 mm 13 67 in 214 6 mm 8 45 in 211 6 mm 8 33 in 214 6 mm x 211 6 mm 8 45 in x 8 33 in Weight ...

Page 18: ... 119 42 BTU hour maximum 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 comput...

Page 19: ...ve BLUE 35 W maximum 30 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 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 ...

Page 20: ...e 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 Video Red 2 Video Green 3 Video Blue 4 GND 5 Self test 6 GND R 7 GND G 8 GND B 9 DDC 5 V 10 GND sync 11 GND 12 DDC data 13 H sync 14 V sync 15 DDC clo...

Page 21: ...S 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 ...

Page 22: ... 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 ...

Page 23: ...ettings 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 u...

Page 24: ...our 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 a...

Page 25: ...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 th...

Page 26: ...26 Setting Up the Monitor 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 ...

Page 27: ...ertical 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 ...

Page 28: ...s 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...

Page 29: ...ce 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...

Page 30: ...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...

Page 31: ... 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 bear...

Page 32: ... to the main menu or exit the OSD main menu 2 Use this button to select the next item down the list or decrease the setting value When not in OSD menu directly enters Contrast Brightness 3 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 4 Use this button to select the OSD menu When not in OSD menu directly ent...

Page 33: ...r the OSD menu to disappear Press the button to open the OSD menu and display the main menu Icon Menu and Submenus 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 A u t o A d j u s t C o n t r a s t B r i g h t n e s s I n p u t S o u r c e A u d i o A d j u s t C...

Page 34: ...e s s D C R 7 5 E C O 1 E x i t S e l e c t 2 C o n t r a s t 7 5 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 DC...

Page 35: ...V G A H D M I A u t o D2421DS 1 E x i t I n p u t S o u r c e H D M I 1 H D M I 2 H D M I 3 D P A u t o VGA Select VGA input when you are using the analog VGA connector Push to select the VGA input source HDMI Select HDMI input when you are using the HDMI connector Push to select the HDMI input source DP Select DP input when you are using the DP connector Push to select the DP input source Auto Se...

Page 36: ... 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 C o l o r A d j u s t 1 E x i t W a r m C o m f o r t V i e w U s e r C o l o r C o l o r V i s i o n M o d e N o r m a l C o o l C o l o r A d j u s t 1 E x i t W a r m C o m f o r t V i e w U s e r C o l o r C o l o r V i s i o n M o d e N o r m a l ...

Page 37: ...ently 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 Color Visi...

Page 38: ...When you select Manual Image Adjust you can choose Sharpness Aspect Ratio and Response Time from the list D2421DS D2421DS M a n u a l I m a g e A d j u s t 1 E x i t S e l e c t 2 S h a r p n e s s A s p e c t R a t i o R e s p o n s e T i m e 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 you...

Page 39: ... e n u 1 E x i t S e l e c t 2 O S D T i m e O u t O S D B a c k g r o u n d O S D P o s i t i o n L a n g u a g e 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...

Page 40: ...itor 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 ...

Page 41: ...roperly using any other electrical equipment Ensure that the power button is depressed fully Ensure that the correct input source is selected via the Input Source select button No Video Power LED on No picture or no brightness Increase brightness contrast controls via OSD Perform monitor self test feature check Check for bent or broken pins in the video cable connector Ensure that the correct inpu...

Page 42: ...port site at www dell com pixelguidelines 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 www dell com pixelguidelines Brightness Problems Picture too dim or too bright Reset the monitor to Factory Reset Auto Adjust...

Page 43: ... 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 comp...

Page 44: ...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 user controls are pressed No picture the LED light is blue When you press up down or Menu key the message No input signal wi...

Page 45: ... dell com support monitors 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 t...

Page 46: ... 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 Ide...

Page 47: ...2421DS 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 Resolutio...

Page 48: ...ption 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 AMD com or www NVIDIA com 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 pr...

Page 49: ...lution 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 monito...

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