DELL U2722DE 27 Inch 16:9 IPS Monitor Owner’s Manual

Service Manual – U2722DE
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 is to replace defective parts. The vendor assumes no liability express or implied, arising out of any unauthorized modification of the design or replacing non-RoHS parts. Service providers assume all liability.
Qualified Repairability:
Proper service and repair is vital to the safe, reliable operation of all series products. The service providers recommended by the vendor should be aware of notices listed in this service manual in order to minimize the risk of personal injury when performing service procedures. Furthermore, the possible existing improper repairing method may damage equipment or products. It is recommended that service engineers should have repair knowledge, and 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 exposure to extremely high humidity environments.
• To ensure the continued reliability of this product, use only the original manufacturer’s specified parts.
• To ensure the following safety repairing behavior, put the replaced part on the components side of PWBA, not the solder side. d
• 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 is requested at 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 the power cable/ connectivity cable, switch off the power before unplugging the cable and replugging in the required cable.

How to connect and disconnect power cable/ connectivity cable

Disassembly and Assembly Procedures

NOTE:
This “Disassembly and Assembly Procedures” is for EMEA only, not for other regions. Please note that Dell will deem the warranty void if any disassembly is done on the monitors.
Tool Required:
List the type and size of the tools that would typically be used to disassemble the product to a point where components and materials requiring selective treatment can be removed.
Tool Description:

• Screwdriver(Phillip’s head) #1
• Screwdriver(Phillip head) #2
• Penknife
• Soldering iron and absorber

5.1 Disassembly Procedures:
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 caps.
(No.1~4 screw size=M4x11; Torque=11±1kgfxcm)

S3 Wedge your fingers between the 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, and 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 from the connector of the interface board, and then remove the rear cover and put it aside for later disassembling.

S5 Use a Philips-head screwdriver to remove 2pcs screw for unlocking the keyboard, then tear off the tapes and release the keyboard.
(No.1~2 screw size=M2x2.4, Torque=0.8~1kgfxcm)

S6 Tear off 1pcs aluminum foil for unfixing the bracket as the picture below shows.

S7 Use a Philips-head screwdriver to release one screw for unlocking the USB board and disconnect the two cables, then release the USB board from the hooks of the middle bezel.
(No.1screw size=M3x6, Torque=4±0.5kgfxcm)

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. Disconnect the LED cable from the connector of the interface board.

S10 Tear off the tape on the back of the panel module for releasing the LED cable, then the middle bezel, put it on a cushion foam, and then tear off the mylar tape for releasing the LED board. lift up and take away the

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 bearing 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.

S14 Remove the Mylar tape from the hooks of the bracket.

S15 Use a Philips-head screwdriver to remove screws for the interface board and power board. 6pcs
(No.1 screw size=M4x8, Torque=7±1kgfxcm;
No.2~6 screw size=M3x7.5, Torque=7±1kgfxcm)

S16 Remove the power board and interface board by disconnecting all of the cables. bracket chassis module carefully, and then

5.2 Assembly Procedures:
S1 Place a bracket chassis base on a protective cushion, then sticks 4pcs Silicon sheets on the positions as the picture below shows.

S2 Take a power board and put the power board into the bracket chassis, and settle the cable to the correct position.

S3 Take an interface board, connect 1pcs LVDS cable and 1pcs panel lamp cable to the connectors of the interface board, then connect the cable of the power board with the interface board. Turn over the interface board and locate it to the bracket. Use a Philips-head screwdriver to tighten 7pcs screws for locking the interface board and power board.
(No.1 screw size=M4x8, Torque=7.5±0.5kgfxcm;
No.2~7 screw size=M4x8, Torque=7.5±0.5kgfxcm)

S4 Take a black mylar to insert the bracket hooks to cover the power board, then tear off the gummed paper of the panel lamp cable and locate the cable into the hook of the bracket.

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 the inspection criteria of the panel. Turn over the panel module to place the screen faced down for later assembly.

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 keyboard 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 shows.

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 settle and fix the LED cable on the back of the panel module.

S11 Connect the panel lamp cable to the connector of the panel module. Connect the LED cable to the connector of the interface board.

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 Take 1pcs USB board, 2pcs cables and 1pcs conductive foam. Connect the 2pcs cables to the connectors of the Usb board, then turn over the board and paste the conductive foam on the back of the USB board, and then locate the USB board inthe correct position of the middle bezel. Use a Philips-head screwdriver to tighten the 1pcs screw for locking the USB unit with the middle bezel, then connect the two USB cables to the connectors of the interface board.
(No.1 screw size=M3x6, Torque=4±0.5kgfxcm)

S14 Paste 1pcs aluminum foil to fix the bracket on the specific position as the picture below shown.

S15 Take 1pcs joystick key and 1pcs OSD board and 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 the 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. Put down the rear cover and push the rear cover on the positions marked in the picture below shown for mechanisms of 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 2pcs DP out Caps into the DP out connectors. (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 a power supply and a video signal to the monitor, then turn on the monitor for functionality check.

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 analog cables from the back of the 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 becomes disconnected 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:

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
in the Input Source menu.
No Video/ Power LED on| No picture or no brightness| • Increase brightness and contrast controls via
OLD
• 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| The 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 the Dell Support site at: https://www.dell.com/pixelguidelines.
Stuck-on Pixels| The 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 the 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.
Intermittent Problems| 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| The picture color is not good| • Try different Preset Modes in Color settings OSD.
• Adjust R/G/B value under Custom Color in the 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| A 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 settings.
• Alternatively, use a dynamically changing screensaver.
The screen image is too small| The image is centered on the screen but does not fill the entire viewing area| • Check the Aspect Ratio setting in the 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 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 the 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 cards cannot support DP 1.4 monitors. Go to the 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 a 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 the 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 a 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 a USB-C connection to a computer, laptop, and so on (U2722DE only)| Intermittent charging| • Check if the maximum power consumption of the device is over 90 W.
• Ensure that you use only Dell-approved adapted 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 the OSD menu, under Display Info check if the ink Rate is HBR2 or HBR3, if Link Rate is HBR2, suggest using USB-C to DP cable to turn on MST.
No network connection| The network dropped or Intermittent| • Do not toggle Off/On the power button when the network is connected, keep 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 to the monitor and the hub/router/ firewall.
• Check the status LED of the Ethernet cable to confirm onnectivity. 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, and plug in the monitor power cord and Type-C cable.
USB interface is not working| USB peripherals are not working| • Check that your display is turned ON.
• Reconnect the upstream able 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 a 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 the input source and USB pairing table.

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