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| Operating the Monitor

OSD Warning Messages

When the monitor does not support a particular resolution mode, you can see the following

message:

U2421HE

Dell UltraSharp 24 Monitor

The current input timing is not supported by the monitor display. Please

change your input timing to

listed timing as per the monitor specifications.

1920x1080, 60Hz

or any other monitor

U2421HE

U2721DE

Dell UltraSharp 27 Monitor

The current input timing is not supported by the monitor display. Please

change your input timing to

listed timing as per the monitor specifications.

2560x1440, 60Hz

or any other monitor

U2721DE

This means that the monitor cannot synchronize with the signal that it is receiving from

the computer. See

Monitor Specifications

for the Horizontal and Vertical frequency ranges

addressable by this monitor. Recommended mode is 1920 x 1080 (U2421HE) / 2560 x 1440

(U2721DE).

You can see the following message before the DDC/CI function is disabled:

Dell UltraSharp 24/27 Monitor

The function of adjusting display setting using PC

application will be disabled.

Do you wish to disable DDC/CI function?

Yes

U2421HE/U2721DE

Содержание UltraSharp U2421HE

Страница 1: ...Model U2421HE U2721DE Regulatory model U2421HEt U2721DEt Dell UltraSharp 24 27 USB C Hub Monitor U2421HE U2721DE User s Guide ...

Страница 2: ...r 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 03 Rev A00 ...

Страница 3: ... 25 Attaching the Stand 25 Using the Tilt Swivel and Vertical Extension 27 Adjusting the Rotation Display Settings of Your System 28 Connecting Your Monitor 29 Organizing Your Cables 32 Removing the Monitor Stand 32 Wall Mounting Optional 33 Operating the Monitor 34 Turning on the Monitor 34 Using the Front Panel Controls 34 Using the OSD Lock function 36 Using the On Screen Display OSD Menu 39 Co...

Страница 4: ...t 54 Built in Diagnostics 55 Common Problems 56 Product Specific Problems 57 Appendix 59 Safety Instructions 59 FCC Notices U S only and Other Regulatory Information 59 Contacting Dell 59 Setting Up Your Monitor 60 Maintenance Guidelines 62 ...

Страница 5: ...Make sure that you have received all the components and contact Dell if something 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 Stand riser Stand base Power cable varies by country USB Type C cable C to C ...

Страница 6: ...crystal display LCD and LED backlight The monitor features include U2421HE 60 47 cm 23 8 in active area display Measured diagonally 1920 x 1080 16 9 resolution plus full screen support for lower resolutions U2721DE 68 47 cm 27 in active area display Measured diagonally 2560 x 1440 16 9 resolution plus full screen support for lower resolutions Wide viewing angles with 99 sRGB color with an average ...

Страница 7: ...About Your Monitor 7 Identifying Parts and Controls Front view 1 2 Label Description 1 Function buttons For more information see Operating the Monitor 2 Power on off button with LED indicator ...

Страница 8: ...lla varustettuun pistorasiaan Consumo de energía en operación XX X Wh This equipment complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 This equipment may not cause harmful interference and 2 this equipment must accept any interference received including interference that may cause undesired operation ID XXXXXXXXXX ID XXXXXXXXXX X X X X X X X X XXXXX Addr...

Страница 9: ... DP port out DP output for MST multi stream transport capable monitor To enable MST refer to instruction on section Connecting the Monitor for DP MST Function NOTE Remove the rubber plug when using DP out connector 6 8 USB downstream ports 2 Connect your USB device You can use these ports only after you have connected the USB cable Type C to Type C from the computer to the monitor Port with batter...

Страница 10: ...m x 0 2745 mm 0 233 mm x 0 233 mm Pixel per inch PPI 92 5 109 Viewing angle Horizontal 178 typical 178 typical Vertical 178 typical 178 typical Brightness 250 cd m typical 350 cd m typical Contrast ratio 1000 to 1 typical 1000 to 1 typical Display screen coating Anti glare treatment of the front polarizer 3H hard coating Anti glare treatment of the front polarizer 3H hard coating Backlight LED LED...

Страница 11: ... 5 0 mm Top 5 1 mm Left Right 8 0 mm Bottom 6 90 mm Top 6 90 mm Left Right 8 1 mm Bottom Adjustability Height adjustable stand 130 mm 130 mm Tilt 5 to 21 5 to 21 Swivel 40 to 40 40 to 40 Cable management Yes Yes Dell Display Manager DDM Compatibility Easy Arrange and other key features Easy Arrange and other key features Security Security lock slot cable lock sold separately Anti theft stand lock ...

Страница 12: ... 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 U2721DE Display Mode Horizontal Frequency kHz Vertical Frequency Hz Pixel Clock MHz Sync Polarity Horizontal Vertical 720 x 400 31 5 70 0 28 3 VESA 640 x 480 31 5 60 0 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 6...

Страница 13: ...rs that can be supported 2560 x 1440 60 Hz 2560 x 1440 60 Hz 1 NOTE Maximum external monitor resolution supported is 2560 x 1440 60 Hz only USB C MST Multi Stream Transport MST Modes U2421HE OSD Dislay Info Link rate current Maximum number of external monitors that can be supported 1920 x 1080 60 Hz HBR3 2 HBR2 1 U2721DE OSD Dislay Info Link rate current Maximum number of external monitors that ca...

Страница 14: ...BC 1 2 DP connector include DP in and DP out HDMI connector USB Type C connector Audio line out RJ45 connector USB 3 0 downstream port connector x 4 Port with battery icon supports BC 1 2 Signal cable type DP to DP 1 8 M cable USB Type C 1 0 M cable DP to DP 1 8 M cable USB Type C 1 0 M cable Dimensions with stand Height extended 478 4 mm 18 84 in 520 2 mm 20 48 in Height compressed 348 4 mm 13 72...

Страница 15: ...ied Monitor EPEAT registered where applicable EPEAT registration varies by country See www epeat net for registration status by country TCO Certified Display RoHS Compliant BFR PVC Free monitor excluding external cables Meets NFPA 99 leakage current requirements Arsenic Free glass and Mercury Free for the panel only Temperature Operating 0 C to 40 C 32 F to 104 F Non operating 20 C to 60 C 4 F to ...

Страница 16: ...e U2421HE VESA Modes Horizontal Sync Vertical Sync Video Power Indicator Power Consumption Normal operation Active Active Active White 140 W maximum 17 5 W typical Active off mode Inactive Inactive Off White Glowing Less than 0 3 W Switch off Off Less than 0 3 W Power Consumption Pon 12 87 W Total Energy Consumption TEC 43 56 kWh U2721DE VESA Modes Horizontal Sync Vertical Sync Video Power Indicat...

Страница 17: ...erently depending on the software components and peripherals you ordered and shall have no obligation to update such information Accordingly the customer should not rely upon this information in making decisions about electrical tolerances or otherwise No warranty as to accuracy or completeness is expressed or implied Activate the computer and the monitor to gain access to the OSD NOTE This monito...

Страница 18: ...port in Pin number 20 pin side of the connected signal cable 1 ML3 n 2 GND 3 ML3 p 4 ML2 n 5 GND 6 ML2 p 7 ML1 n 8 GND 9 ML1 p 10 ML0 n 11 GND 12 ML0 p 13 CONFIG1 14 CONFIG2 15 AUX CH p 16 GND 17 AUX CH n 18 Hot Plug Detect 19 Return 20 DP_PWR ...

Страница 19: ...Pin number 20 pin side of the connected signal cable 1 ML0 p 2 GND 3 ML0 n 4 ML1 p 5 GND 6 ML1 n 7 ML2 p 8 GND 9 ML2 n 10 ML3 p 11 GND 12 ML3 n 13 CONFIG1 14 CONFIG2 15 AUX CH p 16 GND 17 AUX CH n 18 Hot Plug Detect 19 Return 20 DP_PWR ...

Страница 20: ...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 CEC 14 Reserved N C on device 15 DDC CLOCK SCL 16 DDC DATA SDA 17 DDC CEC Ground 18 5 V POWER 19 HOT PLUG DETECT ...

Страница 21: ...C port Pin Signal Pin Signal A1 GND B12 GND A2 SSTXp1 B11 SSRXp1 A3 SSTXn1 B10 SSRXn1 A4 VBUS B9 VBUS A5 CC1 B8 SBU2 A6 Dp1 B7 Dn1 A7 Dn1 B6 Dp1 A8 SBU1 B5 CC2 A9 VBUS B4 VBUS A10 SSRXn2 B3 SSTXn2 A11 SSRXp2 B2 SSTXp2 A12 GND B1 GND ...

Страница 22: ...or s USB ports work only when the monitor is on or in the power save mode In power save mode if the USB cable Type C to Type C is plugged in the USB ports can work normally Otherwise follow the OSD setting of USB if the setting is On During Standby then USB work normally otherwise USB is disabled If you turn off the monitor and then turn it on the attached peripherals may take a few seconds to res...

Страница 23: ...8 8 1 LAN driver V8 55 Win10 LAN driver V10 34 Linux OS Chorms Android Other Linux based OS The Linux OS base on kernel version support to V4 15 or before LAN driver V2 12 0 macOS V10 6 to V10 15 LAN driver V1 0 20 Network RJ45 data rate via USB C at 1 video priority 480 Mbps 2 data priority 1000 Mbps NOTE This LAN port is 1000Base T IEEE 802 3az compliant supporting Mac Address Pass thru and Wake...

Страница 24: ...ttings 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 and Pixel Policy During the LCD monitor manufacturing process it is not uncommon for one or more pixels to become fixed in an unchanging state which are hard to see and do not affect the display quality o...

Страница 25: ...r stand see the documentation shipped with the stand to set it up CAUTION Place monitor of a flat clean and soft surface to avoid scratching the display panel To attach the monitor stand 1 Align the stand base protruded blocks to the matching slot on the stand 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 ...

Страница 26: ...e the monitor protective cover and place the monitor with its front facing downward on it 2 Insert the two tabs on the upper part of the stand to the groove on the back of the monitor 3 Press the stand down till it snaps into its place ...

Страница 27: ... from the factory 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 2 1 90 90 NOTE To use the Display Rotation function Landscape versus Portrait view with your Dell computer you require an updated graphics driver that is not included with this monitor To download the graphics driv...

Страница 28: ...y Settings 1 Right click on the desktop and click Properties 2 Select the Settings tab and click Advanced 3 If you have an AMD graphics card select the Rotation tab and set the preferred rotation 4 If you have an nVidia graphics card click the nVidia tab in the left hand column select NVRotate and then select the preferred rotation 5 If you have an Intel graphics card select the Intel graphics tab...

Страница 29: ...type C cable from your monitor to the computer 3 Switch on your monitor 4 Select the correct input source at monitor OSD Menu and turn on your computer NOTE U2421HE U2721DE default setting is DP 1 4 A DP 1 1 Graphic card may not display normally Please refer to product specific problems No image when using DP connection to the PC to change default setting Connecting the HDMI cable Optional HDMI HD...

Страница 30: ... USB Type C The USB Type C port on your monitor Can be used as USB Type C or DisplayPort 1 4 alternatively Supports USB Power Delivery PD with profiles up to 65 W NOTE Regardless of the power requirement actual power consumption of your laptop or the remaining power runtime in your battery the Dell U2421HE U2721DE monitor is designed to supply power delivery of up to 65 W to your laptop Rated powe...

Страница 31: ...aximum number of supported U2721DE via MST is subjected to the bandwith of the USB C source Please refer to product specific problems No image when using USB C MST NOTE Remove the rubber plug when using DP out connector Connecting the monitor for RJ45 Cable Optional USB Type C USB Type C RJ45 NOTE RJ45 cable is non in box standard accessory ...

Страница 32: ... To prevent scratches on the LCD screen while removing the stand make sure that the monitor is placed on a soft clean surface NOTE The procedure below is applicable for the default stand If you purchased any other stand see the documentation shipped with the stand to set it up To remove the stand 1 Place the monitor on a soft cloth or cushion 2 Press and hold the stand release button 3 Lift the st...

Страница 33: ...shion on a stable flat table 2 Remove the stand 3 Use a Phillips crosshead screwdriver to remove the four screws securing the plastic cover 4 Attach the mounting bracket from the wall mounting kit to the monitor 5 Mount the monitor on the wall by following the instructions that comes with the wall mounting kit NOTE For use only with UL or CSA or GS listed wall mount bracket with minimum weight loa...

Страница 34: ...rn on the monitor Using the Front Panel Controls Use the control buttons at the bottom edge of the monitor to adjust the characteristics of the image being displayed As you use these buttons to adjust the controls an OSD shows the numeric values of the characteristics as they change 3 4 5 1 2 ...

Страница 35: ...tton to choose from a list of Input Source 3 Menu Use this menu button to launch the on screen display OSD and select the OSD menu See Accessing the Menu System 4 Exit Use this button to go back to the main menu or exit the OSD main menu 5 Power with power light indicator Use the Power button to turn the monitor On and Off The white LED indicates the monitor is On and fully functional A glowing wh...

Страница 36: ...enu Power Buttons Disable Menu Buttons Menu Personalize Others 1 The following message will appear Dell UltraSharp 24 27 Monitor Are you sure you want to lock the Menu Buttons To unlock the Buttons refer to the User s Guide Yes No U2421HE U2721DE 2 Select Yes to Lock the buttons the following table describes the control icons Options Description 1 Menu Buttons lock Use this icon to lock OSD menu f...

Страница 37: ...stics 3 Hold for 4 seconds Select the following table describes the unlock icons Options Description 1 Menu Buttons lock Use this icon to unlock OSD menu function 2 Power button lock Use this icon to unlock power button from powering off 3 Menu and Power buttons lock Use this icon to unlock OSD menu and power button from powering off ...

Страница 38: ... of the monitor to adjust the image settings 2 3 1 Front Panel Button Description 1 Up Down Use the Up increase and Down decrease keys to adjust items in the OSD menu 2 OK Use the OK button to confirm your selection 3 Back Use the Back button to go back to the previous menu ...

Страница 39: ...p 24 27 Monitor Brightness Contrast Color Display Input Source 75 75 Menu Personalize Others 2 Press the and buttons to move between options As you move from one icon to another the option name is highlighted 3 Press the or or button once to activate the highlighted option 4 Press the and buttons to select the desired parameter 5 Press to enter the slide bar and then use the or button according to...

Страница 40: ...htness Contrast Adjust the Brightness first and then adjust Contrast only if further adjustment is necessary Press the button to increase contrast and press the button to decrease contrast between 0 and 100 Contrast adjusts the difference between darkness and lightness on the monitor Input Source Use the Input Source menu to select between different video inputs that are connected to your monitor ...

Страница 41: ... Select for USB C Allows you to set Auto Select for USB Type C to Prompt for Multiple Inputs always show Switch to USB Type C Video Input message for user to choose whether to switch or not Yes The monitor always switch to USB Type C video without asking while USB Type C connected No The monitor will NOT auto switch to USB Type C video from another available input Reset Input Source Resets your mo...

Страница 42: ...itor for long periods of time we suggest you to Set the screen about 20 to 28 in 50 70 cm from your eyes Blink frequently to moisten or rewet your eyes when working with the monitor Take regular and frequent breaks for 20 minutes 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...

Страница 43: ...orts only YPbPr output Dell UltraSharp 24 27 Monitor Input Color Format Preset Modes Reset Color RGB YPbPr Brightness Contrast Color Display Input Source Menu Personalize Others Hue Use or to adjust the hue from 0 to 100 NOTE Hue adjustment is available only for Movie and Game mode Saturation Use or to adjust the saturation from 0 to 100 NOTE Saturation adjustment is available only for Movie and G...

Страница 44: ...e Time Allows you to set the Response Time to Normal or Fast MST DP Multi Stream Transport Set to ON enables MST DP out Set to OFF disables MST function NOTE When DP USB Type C upstream cable and DP downstream cable is connected monitor will set MST ON automatically this action will only be done once after Factory Reset or Display Reset USB C Prioritization U2721DE only High Resolution High Resolu...

Страница 45: ... Disable Menu Personalize Others Language Set the OSD display to one of eight languages English Spanish French German Brazilian Portuguese Russian Simplified Chinese or Japanese Rotation Rotates the OSD by 0 90 180 270 degrees You can adjust the menu according to your display rotation Transparency Select this option to change the menu transparency by using and min 0 max 100 Timer OSD Hold Time Set...

Страница 46: ...e Transparency Timer Lock Reset Menu Power Button Menu Power Buttons Disable Menu Buttons Menu Personalize Others Menu Buttons Through OSD to lock the Menu buttons Power Button Through OSD to lock the Power button Menu Power Buttons Through OSD to lock the all of Menu and Power buttons Disable Press and hold the button on the left of the power button for 4 sec Reset Menu Restore the menu settings ...

Страница 47: ...ontrast Input Source Aspect Ratio Rotation set as shortcut key 2 Power Button LED Allows you to set the state of the power light to save energy USB A Charging Allows you to enable or disable USB Type A Downstream Ports charging function during monitor standby mode NOTE This option is only available when the USB Type C Upstream Port cable is unplugged If the USB Type C cable is connected USB A Char...

Страница 48: ...ch as the DDC CI LCD conditioning and so on Display Info Displays the monitor s current settings DDC CI DDC CI Display Data Channel Command Interface allows you to adjust the monitor settings using software on your computer Select Off to turn off this feature Enable this feature for best user experience and optimum performance of your monitor Dell UltraSharp 24 27 Monitor Off On LCD Conditioning D...

Страница 49: ...Tag Displays the Service Tag The Service Tag is a unique alphanumeric identifier that allows Dell to identify the product specifications and access warranty information NOTE The Service Tag is also printed on a label located at the back of the cover Reset Others Restores other settings such as DDC CI to factory defaults Factory Reset Restores all preset values to the factory default settings These...

Страница 50: ... monitor display Please change your input timing to listed timing as per the monitor specifications 2560x1440 60Hz or any other monitor U2721DE This means that the monitor cannot synchronize with the signal that it is receiving from the computer See Monitor Specifications for the Horizontal and Vertical frequency ranges addressable by this monitor Recommended mode is 1920 x 1080 U2421HE 2560 x 144...

Страница 51: ...vice Press any key on the keyboard or move the mouse or wake it up If there is no display press the monitor button again to select the correct input source If either DP USB Type C input is selected and the corresponding cable is not connected a floating dialog box as shown below appears Dell UltraSharp 24 27 Monitor The display will go into Power Save Mode in 4 minutes No DP Cable www dell com sup...

Страница 52: ...resolution in Display feature the following message will appear Dell UltraSharp 27 Monitor U2721DE If your PC is not DP 1 4 this option will result in reduced screen performance Please disconnect any USB storage device to your monitor during the switching process up to 12 seconds Do you want to continue Yes No When you select OSD items of High Data Speed in Display feature the following message wi...

Страница 53: ...ory Reset in Other feature the following message will appear Dell UltraSharp 24 27 Monitor Are you sure you want to reset to default settings Yes No U2421HE U2721DE When you select Yes to reset to default settings the following message will appear Dell UltraSharp 24 27 Monitor Easy Initial Setup Select Yes to enable the following function s Always on USB C Charging Yes No U2421HE U2721DE When Yes ...

Страница 54: ...se a video signal and is working correctly While in self test mode the power LED remains white Also depending upon the selected input one of the dialogs shown below will continuously scroll through the screen Dell UltraSharp 24 27 Monitor The display will go into Power Save Mode in 4 minutes No DP Cable www dell com support U2421HE www dell com support U2721DE U2421HE U2721DE or Dell UltraSharp 24...

Страница 55: ...en 2 Unplug the video cable s from the back of the computer or monitor The monitor then goes into the self test mode 3 Press and hold Button 1 for 5 seconds A gray screen appears 4 Carefully inspect the screen for abnormalities 5 Press Button 1 on the front panel again The color of the screen changes to red 6 Inspect the display for any abnormalities 7 Repeat steps 5 and 6 to inspect the display i...

Страница 56: ...ssing 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 www dell com support monitors 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 F...

Страница 57: ...feature to turn off the monitor at all times when not in use for more information see Power Management Modes Alternatively use a dynamically changing screensaver Product Specific Problems Problem What you experience Possible solutions Screen image is too small Image is centered on screen but does not fill entire viewing area Check the Aspect Ratio setting in the Display menu OSD Reset the monitor ...

Страница 58: ...r or the adapter that comes with the product Ensure that the USB Type C cable is not damaged Intermittent charging when using USB Type C connection to computer laptop and so on Intermittent charging Check if the maximum power consumption of device is over 65 W Ensure that you use only Dell approved adapter or the adapter that comes with the product Ensure that the USB Type C cable is not damaged N...

Страница 59: ...ww dell com regulatory_compliance Contacting 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 su...

Страница 60: ...ck on the desktop and click Display Settings 2 Click Advanced display settings 3 Click the dropdown list of Resolution and select 1920 x 1080 U2421HE 2560 x 1440 U2721DE 4 Click Apply If you do not see the recommended resolution as an option you may need to update your graphics driver Please choose the scenario below that best describes the computer system you are using and follow the given steps ...

Страница 61: ... for your graphics adapter attempt to set the resolution to 1920 x 1080 U2421HE 2560 x 1440 U2721DE 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 we...

Страница 62: ...l screen cleaning tissue or solution suitable for the anti static coating Do not use benzene thinner ammonia abrasive cleaners or compressed air Use a lightly dampened soft cloth to clean the monitor Avoid using detergent of any kind as some detergents leave a milky film on the monitor If you notice white powder when you unpack your monitor wipe it off with a cloth Handle your monitor with care as...

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