Dell U2722DE, Service Manual

Page 1: ...Version 01 Date 2021 10 30 Service Manual U2722DE ...

Page 2: ...ipment 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 awa...

Page 3: ...own 4 Select the appropriate service or support link based on your need 5 Choose the method of contacting Dell that is convenient for you 15 14 16 13 Item Description Q ty Remark 1 1 For EMEA Only not for other regions 2 Safety Mylar 1 1 3 4 1 1 5 6 IF BD 1 1 7 8 1 9 10 11 1 1 Joystick BD 12 1 13 1 14 USB BD Panel Key BD Power BD ASSY Chassis 1 1 15 1 1 ASSY Rear Cover 16 See NOTE See NOTE ASSY RI...

Page 4: ...3 Wiring Connectivity Diagram ...

Page 5: ...4 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 ...

Page 6: ...4 How to connect and disconnect power cable connectivity cable ...

Page 7: ...4 How to connect and disconnect power cable connectivity cable ...

Page 8: ...board then tear off the tapes and release the key board No 1 2 screw size M2x2 4 Torque 0 8 1kgfxcm 1 2 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 Tear off 1pcs aluminum foil for unfixing the bracket as the picture below shown 1 S3 ...

Page 9: ...ut the bracket chassis module on a protective cushion S13 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 Disconnect the panel lamp from the connector of the panel Disconnect the LED cable from the connector of the interface board Tear off the tape on the back of panel module for releasing the LED...

Page 10: ...and power board 6pcs No 1 screw size M4x8 Torque 7 1kgfxcm No 2 6 screw size M3x7 5 Torque 7 1kgfxcm S15 Remove the power board board and interface board from the disconnect all of the cables bracket chassis module carefully and then Remove the Mylar tape from the hooks of the bracket S14 S16 1 3 4 2 6 5 6 ...

Page 11: ... connect the cable of the power board with 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 S3 Panel preparation Take out 1pcs panel module from the carton remove the protective film by ...

Page 12: ...n paste 1pcs mylar tape to cover the LED board as the picture below shown 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 S11 4 1 1 1 Connect the panel lamp cable to the connector of the panel module Connect the LED cable to the connector of the interface board Tear off the release paper of the adhesive tape on t...

Page 13: ...ve 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 as the picture below shown for mechanisms engagement S16 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 t...

Page 14: ...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 S18 S19 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...

Page 15: ...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 No DP Cable The display will go into Standby Mode in 4 minutes www dell com U2722D DX DE or No HDMI Cable The display will go into Standby Mode in 4 minutes www dell com U2722D DX DE or U2722DE only No USB C C...

Page 16: ... 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 pixelgui...

Page 17: ...r 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 th...

Page 18: ... 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 inst...

Page 19: ...creen 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 conne...

Page 20: ...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 t...