DELL-U2722DWOST UltraSharp WOST LED display User Guide

Service Manual – U2722D/DX
Version: 01
Date: 2021/10/30

Important Safety Notice

Product Announcement:
This product is certificated to meet RoHS Directive and Lead-Free produced definition.
Using approved critical components only is recommended when the situation to replace defective parts. Vender assumes no liability express or implied, arising out of any unauthorized modification of design or replacing non-RoHS parts. Service providers assume all liability.
Qualified Repairability:
Proper service and repair is important to the safe, reliable operation of all series products. The service providers recommended by vender should be aware of notices listed in this service manual in order to minimize the risk of personal injury when perform service procedures. Furthermore, the possible existed improper repairing method may damage equipment or products. It is recommended that service engineers should have repairing knowledge, experience, as well as appropriate product training per new model before performing the service procedures.
NOTICE:

• To avoid electrical shocks, the products should be connected to an authorized power cord, and turn off the master power switch each time before removing the AC power cord.
• To prevent the product away from water or expose in extremely high humility environment.
• To ensure the continued reliability of this product, use only original manufacturer’s specified parts.
• To ensure following safety repairing behavior, put the replaced part on the components side of PWBA, not solder side.
• To ensure using a proper screwdriver, follow the torque and force listed in assembly and disassembly procedures to unscrew screws.
• Using Lead-Free solder to well mounted the parts.
• The fusion point of Lead-Free solder requested in the degree of 220°C.

Exploded view diagram with list of items

NOTE:
For replacement of power cord, connectivity cable and external power supply (if applicable), contact Dell:

1. Go to https://www.dell.com/support.
2. Verify your country or region in the Choose A Country/Region drop-down menu at the bottom-right 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.

Wiring Connectivity Diagram

How to connect and disconnect power cable/ connectivity cable

WARNING: To change power cable/ connectivity cable, switch off power before unplugging the cable and replugging in required cable. Connecting the HDMI Cable (U2722DX (Inbox) / U2722D (Optional))
Connecting the DP CableConnecting the Monitor for DP Multi-Stream Transport (MST) Function
Connecting the USB-C Cable (A to C)
Connecting the USB-C Cable (C to C) (Optional)

Disassembly and Assembly Procedures

NOTE:
This “Disassembly and Assembly Procedures” is for EMEA only, not for other regions. Please note that Dell will deem warranty void if any disassembly is done on the monitors.
Tool Required:
List the type and size of the tools that would typically can be used to disassemble the product to a point where components and materials requiring selective treatment can be removed.
Tool Description:
– Screwdriver(Phillip head) #1
– Screwdriver(Phillip head) #2
– Penknife
– Soldering iron and absorber
5.1 Disassembly Procedures:
S1
Remove the monitor stand base:

1. Place the monitor on a soft cloth or cushion.
2. Press and hold the stand-release button.
3. Lift the stand up and away from the monitor.

S2
Use a Philips-head screwdriver to remove 4pcs screws for unlocking mechanisms. Remove DP cap.
(No.1~4 screw size=M4x11; Torque=11±1kgfxcm) S3
Wedge your fingers between rear cover and the middle bezel on the corners of the top side of the monitor to release the rear cover, then use one hand to press the middle bezel, the other hand to pull up carefully the rear cover in order of arrow preference for unlocking mechanisms of rear cover. S4
Lift the rear cover up carefully. Disconnect the joystick key cable and Usb EDP cable from the connectors of the interface board, and then remove the rear cover. S5
Use a Philips-head screwdriver to remove 2pcs screw for unlocking the key board, then tear off the tapes and release the key board.
(No.1~2 screw size=M2x2.4, Torque=0.8~1kgfxcm) S6
Use a Philips-head screwdriver to release one screw for unlocking the USB board, then release the USB board from the hooks of the middle bezel and then remove the USB board unit.
(No.1screw size=M3x6, Torque=4±0.5kgfxcm) S7
Tear off 1pcs aluminum foil for unfixing the bracket, and then disconnect the LED cable from the connector of the interface board. S8
Use a Philips-head screwdriver to remove 13pcs screws for unlocking the middle bezel with the panel module.
(No.1~13 screw size=M3x5, Torque=5±0.5kgfxcm) S9
Disconnect the panel lamp from the connector of the panel, then release the panel lamp cable from the hooks of the middle bezel. S10
Tear off the tape on the back of panel module for releasing the LED cable, then lift up and take away the middle bezel, and put it on a cushion foam, and then tear off the mylar tape for releasing the LED board. S11
Use a Philips-head screwdriver to remove 4pcs screws for unlocking the bracket chassis module with the panel .
(No.1~4 Screw size= M3x5, Torque=5±0.5kgfxcm)  S12
Move up the bracket, then push the earing-lock and disconnect the LVDS cable away from the connectors of the panel module. S13
Take away the bracket chassis module and then put the bracket chassis module on a protective cushion. ![DELL-U2722DWOST UltraSharp WOST LED display

• Assembly 14](https://manuals.plus/wp-content/uploads/2023/08/DELL- U2722DWOST-UltraSharp-WOST-LED-display-Assembly-14.jpg)S14
  Remove the Mylar tape from the hooks of the bracket. S15
  Use a Philips-head screwdriver to remove 6pcs screws for interface board and power board.
  (No.1 screw size=M4x8, Torque=7±1kgfxcm;
  No.2~6 screw size=M3x7.5, Torque=7±1kgfxcm) S16
  Remove the power board board and interface board from the bracket chassis module carefully, and then disconnect all of the cables.  5.2 Assembly Procedures:
  S1
  Place a bracket chassis base on a protective cushion, then stick 3pcs Silicon sheets on the positions as the picture below shown. S2
  Turn over a power board and put the power board into the bracket chassis, locate the panel power cable into the hook of the bracket chassis module . S3
  Take a interface board, connect 1pcs LVDS cable and 1pcs EDP cable to the connectors of the interface board, then connect the cable of the power board with interface board. Turn over the interface board and locate the board and EDP cable into the bracket. Use
  a Philips-head screwdriver to tighten 6pcs screws for locking the interface board and power board.
  (No.1 screw size=M4x8, Torque=7.5±0.5kgfxcm;
  No.2~6 screw size=M4x8, Torque=7.5±0.5kgfxcm) S4
  Take a black mylar to insert the hooks of the bracket to cover the power board, then tear off the gum paper of the panel lamp cable. S5
  Panel preparation: Take out 1pcs panel module from the carton, remove the protective film by tearing off the tapes, then examine the panel surface according to inspection criteria of the panel. Turn over the panel module to place the screen faced down for later assembling. S6
  Move the bracket chassis module close to the panel module, then connect the LVDS cable to the connector of the panel module, then turn over the bracket chassis and put it on the back of the bracket chassis module. S7
  Adjust the bracket chassis module, and then use a Philips-head screwdriver to tighten 4pcs screws for locking the bracket chassis module with the panel.
  (No.1~4 Screw size= M3x5, Torque=5±0.5kgfxcm) S8
  Take 1pcs LED key board and 1pcs middle bezel, then put the middle bezel into a fixture jip to fix the middle bezel. Tear off the gum on the back of the board, and then paste the LED board on the correct position of the middle bezel, then paste 1pcs mylar tape to cover the LED board as the picture below shown. S9
  Move the middle bezel with the LED board close to the panel unit, then assemble the middle bezel with the front bezel and panel module. S10
  Tear off the release paper of the adhesive tape on the back of the LED cable, then fix the LED cable on the back of the panel module. S11
  Locate the panel lamp cable into the hooks of the  middle bezel, then connect the panel lamp cable to connector of the panel module. S12
  Use a Philips-head screwdriver to tighten 13pcs screws for locking the middle bezel with the panel module.
  (No.1~13 screw size=M3x5, Torque=5±0.5kgfxcm) S13
  Connect the LED cable to connector of the interface board, then paste 1pcs aluminum foil to fix the bracket on the specific position as the picture below shown. S14
  Take 1pcs USB board and 1pcs conductive foam. Paste the conductive foam on the back of the USB board, and then locate the USB board into the correct position of the middle bezel. Use a Philipshead screwdriver to tighten 1pcs screw for locking the USB unit with the middle bezel.
  (No.1 screw size=M3x6, Torque=4±0.5kgfxcm) S15
  Take 1pcs joystick key and 1pcs OSD board, assemble the joystick key with the OSD board. Locate the board to the correct position of the rear cover, then use a Philips-head screwdriver to tighten 2pcs screws for locking the board with rear cover. Tear off the tape papers on the back of the cable, and then fix the key cable with tapes.
  (No.1~2 screw size=M2x2.4, Torque=0.9±0.1kgfxcm) S16
  Move the assembled rear cover close to the panel unit, then connect the joystick key cable to the connector of interface board. Connect the EDP cable to the connector of the USB board. Put down the rear cover and push the rear cover on the positions marked as the picture below shown for mechanisms engagement. S17
  Use a Philips-head screwdriver to tighten 4pcs screws for locking the rear cover with the unit. Stick two pieces of label on the specific positions, then insert a DP out Cap into the DP out connector.
  (No.1~4 screw size=M4x11; Torque=11±1kgfxcm) S18
  Take a stand base close to the monitor. Fit the two tabs on the upper part of the stand into the grooves, and then lower the stand so that the monitor mounting area snaps onto the stand. S19
  Lift up the monitor to check the gap between the front bezel and the panel, then provide power supply and a video signal to the monitor , then turn on the monitor for functionality check.![DELL-U2722DWOST UltraSharp WOST LED display
• Assembly 37](https://manuals.plus/wp-content/uploads/2023/08/DELL- U2722DWOST-UltraSharp-WOST-LED-display-Assembly-37.jpg)

Trouble Shooting Instructions

Self-Test
Your monitor provides a self-test feature that allows you to check whether your monitor is functioning properly. If your monitor and computer are properly connected but the monitor screen remains dark, run the monitor self- test by performing the following steps:

1. Turn off both your computer and the monitor.

2. Unplug the video cable from the back of the computer. To ensure proper Self-Test operation, remove all digital and the analog cables from the back of computer.

3. Turn on the monitor.
   The floating dialog box should appear on-screen (against a black background), if the monitor cannot sense 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.

4. This box also appears during normal system operation if the video cable becomesdisconnected or damaged.

5. Turn off your monitor and reconnect the video cable; then turn on both your computer and the monitor.

If your monitor screen remains blank after you use the previous procedure, check your video controller and computer, because your monitor is functioning properly.

Common Problems

The following table contains general information about common monitor problems you might encounter and the possible solutions:

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 in the Input Source menu.
No Video/ Power LED on| No picture or no brightness| • Increase brightness and contrast controls via OSD.
• Perform monitor self-test feature check.
• Check for bent or broken pins in the video cable connector.
• Run the built-in diagnostics.
• Ensure that the correct input source is selected in the Input Source menu.
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: https://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 PixelPolicy, see Dell Support site at: https://www.dell.com/pixelguidelines.
Brightness Problems| Picture too dim or too bright| • Reset the monitor to factory settings.
• Adjust brightness and contrast controls via OSD.
Safety Related Issues| Visible signs of smoke or sparks| • Do not perform any troubleshooting steps.
• Contact Dell immediately.
IntermittentProblems| Monitor malfunctions on & off| • Ensure that the video cable connecting the monitor to the computer is connected properly and is secure.
• Reset the monitor to factory settings.
• 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.
• 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.
Wrong Color| Picture color not good| • Try different Preset Modes in Color settings OSD.
• Adjust R/G/B value under Custom Color in Color menu OSD.
• Change the Input Color Format to RGB or YCbCr in the Color settings OSD.
• Run the built-in diagnostics.
Image retention from a static
image left on the monitor for
a long period of time| Faint shadow from the static
image displayed appears on the
screen| • Set the screen to turn off after a few minutes of screen idle time. These can be adjusted in Windows Power Options or Mac Energy Saver
setting.
• Alternatively, use a dynamically changing screensaver.

Product Specific Problems

Display menu OSD.
• Reset the monitor to factory settings.
Cannot adjust the monitor with the buttons on the front panel| OSD does not appear on the screen| • Turn off the monitor, unplug the monitor power cable, plug it back, and then turn on the monitor.
No Input Signal when user
controls are pressed| No picture, the LED light is white| • Check the signal source. Ensure the computer is not in the power saving mode by moving the mouse or pressing any key on the keyboard.
• Check whether the signal cable is plugged in properly. Connect the signal cable again, if necessary.
• Reset the computer or video player.
The picture does not fill the entire screen| The picture cannot fill the height or width of the screen| • Due to different video formats (aspect ratio) of DVDs, the monitor may display in full screen.
• Run the built-in diagnostics.
No image when using DP connection to the PC| Black screen| • Verify which DP standard (DP 1.1a or DP 1.4) is your Graphics Card certified to. Download and install the latest graphics card driver.
• Some DP 1.1a graphics card cannot support DP 1.4 monitors. Go to OSD menu, under Input Source selection, press and hold DP select Joystick key for 8 seconds to change the monitor setting from DP 1.4 to DP 1.1a.
No image when using USB-C
connection to computer, laptop, and so on (U2722DE only)| Black screen| • Verify if the USB-C interface of the device can support DP alternate mode.
• Verify if the device required more than 90 W power charging.
• USB-C interface of device cannot support DP alternate mode.
• Set Windows to Projection mode.
• Ensure that the USB-C cable is not damaged.
No charging when using USB-C
connection to computer, laptop, and so on (U2722DE only)| No charging| • Verify if the device can support one of 5 V/9 V/ 15 V/20 V charging profiles.
• Verify if the Notebook requires a >90 W power adaptor.
• If the Notebook requires a >90 W power adaptor, it may not charge with the USB-C connection.
• Ensure that you use only Dell approved adapter or the adapter that comes with the product.
• Ensure that the USB-C cable is not damaged.
Intermittent charging when using USB-C connection to computer,
laptop, and so on (U2722DE only)| Intermittent charging| • Check if the maximum power consumption of device is over 90 W.
• Ensure that you use only Dell approved adapter or the adapter that comes with the product.
• Ensure that the USB-C cable is not damaged.
No image when using USB-C MST| Black screen or 2nd DUT is not
Prime mode| • USB-C input, Go to OSD menu, under Display Info check the Link Rate is HBR2 or HBR3, if Link Rate is HBR2, suggest to use USB-C to DP cable to turn on MST.
No network connection| Network dropped or Intermittent| • Do not toggle Off/On the power button when network is connected, keeps the power button On.
The LAN port is not functioning
(U2722DE only)| OS setting or cable connection
issue| • Ensure that the latest BIOS and drivers for your computer are installed on your computer.
• Ensure that the RealTek Gigabit Ethernet Controller is installed in the Windows Device Manager.
• If your BIOS Setup has a LAN/GBE Enabled/ Disabled option, make sure it is set to Enabled.
• Ensure that the Ethernet cable is connected securely on the monitor and the hub/router/ firewall.
• Check the status LED of the Ethernet cable to confirm connectivity. Re- connect both ends of the Ethernet cable if the LED is not lit.
• First power off the Computer and unplug the Type-C cable and power cord of the monitor. Then, power on the computer, plug in the monitor power cord and Type-C cable.

Universal Serial Bus (USB) Specific Problems

your display is turned ON.
• Reconnect the upstream cable to your computer.
• Reconnect the USB peripherals (downstream connector).
• Turn off the monitor and turn it on again.
• Reboot the computer.
• Certain USB devices such as portable hard drives require higher power source; connect the drive to the computer directly.
Super speed USB 3.2 Gen2 interface is slow.| Super speed USB 3.2 Gen2 peripherals working slowly
or not working at all| • Check that your computer is USB 3.0-capable.
• Some computers have USB 3.0, USB 2.0, and USB 1.1 ports. Ensure that the correct USB port is used.
• Reconnect the upstream cable to your computer.
• Reconnect the USB peripherals (downstream connector).
• Reboot the computer.
Wireless USB peripherals stop
working when a USB 3.0 device
is plugged in| Wireless USB peripherals responding slowly or only working as the distance between itself and its receiver decreases| • Increase the distance between the USB 3.0 peripherals and the wireless USB receiver.
• Position your wireless USB receiver as close as possible to the wireless USB peripherals.
• Use a USB-extender cable to position the wireless USB receiver as far away as possible from the USB 3.0 port.
USB is not working| No USB functionalities| Refer to input source and USB pairing table.

References

• Computers, Monitors & Technology Solutions | Dell USA

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