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Dell U4025QW Service Manual
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Dell U4025QW Service Manual

Dell U4025QW Service Manual

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Service Manual - U4025QW
Version: 01
Date: 2023/12/26

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Summary of Contents for Dell U4025QW

  • Page 1 Service Manual - U4025QW Version: 01 Date: 2023/12/26...
  • Page 2 1. Important Safety Notice Product Announcement: ! To ensure using a proper screwdriver, follow the This product is certificated to meet RoHS torque and force listed in assembly and Directive and Lead-Free produced definition. disassembly procedures to unscrew screws. Using approved critical components only is ! Using Lead-Free solder to well mounted the recommended when the situation to replace parts.
  • Page 3 See “NOTE” 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.
  • Page 4 3. Wiring Connectivity Diagram LGD 40” WUHD Panel 5120X2160 Ambient Light 120Hz HDR Sensor To Panel BL Speaker 2X9W PWR BD Interface Board USB Board Down Down Down Stream #5 Stream #6 Stream #7 OSD + Joys ck Power Key Audio DP1.4 USB-C Up...

  • Page 5: Connecting The Hdmi Cable

    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. Connecting the HDMI cable Connecting the DP cable...
  • Page 6 4. How to connect and disconnect power cable/ connectivity cable Connecting the Thunderbolt 4 cable Thunderbolt upstream Thunderbolt Connecting the USB-C Cable (A to C) ® Connecting the USB Type-C cable (C to C) (Optional) ®...
  • Page 7 4. How to connect and disconnect power cable/ connectivity cable Connecting the monitor for Thunderbolt 4 daisy chain function Thunderbolt Thunderbolt Thunderbolt upstream downstream upstream Connecting the monitor for RJ45 Cable (Optional) Thunderbolt upstream...
  • Page 8 This “Disassembly and Assembly Procedures” is for EMEA only, cable and sensor cable away from the connectors, not for other regions. Please note that Dell will deem warranty void and then remove the rear cover and put it aside. if any disassembly is done on the monitors.
  • Page 9 5. Disassembly and Assembly Procedures Disconnect the lamp cable, speakers’ cable, LED cable, FFC cable from the connectors of the board. Use a Philips-head screwdriver to remove 4pcs screw for unlocking the USB unit, then disconnect the eDP cable away from board and release the USB unit from the hooks of the middle frame.
  • Page 10 5. Disassembly and Assembly Procedures Lift up the middle frame and put it into a fixture, tear Use a Philips-head screwdriver to remove 9pcs off all the cable tape and the mylar tape for releasing screws for unlocking power board and interface the LED key board away from the middle frame.
  • Page 11 (No.6~8 screw size=M3x6, Torque=5 kgfxcm) ±1 Take 1pcs Dell nameplate, then use a locating fixture to fix the nameplate to the bezel of the module, and then move the whole unit into a laminating fixture, use the machine to press the nameplate with the...
  • Page 12 5. Disassembly and Assembly Procedures foam Move the bracket chassis module close to the panel Turn over the panel module to place screen faced module, then connect the eDP cable to the down. Take 1pcs panel lamp to plug the two connector of the panel, then put the bracket on the connectors of the panel module, then cover the two back of the panel module.
  • Page 13 5. Disassembly and Assembly Procedures Take 1pcs USB board, 1pcs eDP cable, 1pcs FFC Connect the eDP cable to the interface board, cable and 1pcs USB bracket. Connect the eDP then locate the USB unit to the hooks of middle cable and FFC cable to the connectors of the USB frame.
  • Page 14 5. Disassembly and Assembly Procedures Take 1pcs IO cover to assemble with the main bracket Move the assembled rear cover close to the panel chassis, then use a Philips-head screwdriver to lock unit, then connect the joystick key cable and 2pcs screws for locking the IO cover with bracket.
  • Page 15 5. Disassembly and Assembly Procedures Use a protective bag to pack the stand base, then lift up the monitor to checking the gap between the front bezel with panel, then provide power supply and video signal to the monitor, then turn on the monitor for functionality check.
  • Page 16 LED remains white. Also, depending upon the selected input, one of the dialogs that are shown below will continuously scroll through the screen. No DP Cable The display will go into Standby Mode in 4 minutes. www.dell.com/U4025QW No Thunderbolt(140W) Cable The display will go into Standby Mode in 4 minutes. www.dell.com/U4025QW 4.

  • Page 17: Built-In Diagnostics

    6. Trouble Shooting Instructions Built-in diagnostics Your monitor has a built-in diagnostic tool that helps you determine if the screen abnormality you are experiencing is an inherent problem with your monitor, or with your computer and video card. To run the built-in diagnostics: 1.

  • Page 18: Common Problems

    • A pixel that is permanently o is a natural defect that can occur in LCD technology. • For more information about Dell Monitor Quality and Pixel Policy, see Dell Support site www.dell.com/pixelguidelines. https:// Stuck-on pixels LCD screen has •...
  • Page 19 Safety-related Visible signs of smoke • Do not perform any troubleshooting issues or sparks steps. • Contact Dell immediately. Intermittent Monitor malfunctions • Ensure that the video cable connecting problems on and o the monitor to the computer is connected properly and is secure.
  • Page 20 6. Trouble Shooting Instructions Common What you experience Possible solutions Symptoms The monitor Connect the Dock • Connect the monitor directly with the cannot detect platform. USB-C ® cable to the signal connect platform. Connect • Change the TBT4 cable to a USB-C ®...
  • Page 21 6. Trouble Shooting Instructions Product-speci c problems Problem What you experience Possible solutions Screen image is The image is centered • Check the Aspect Ratio setting in the too small on the screen, but Display menu OSD. does not ll the entire •...
  • Page 22 • If the Notebook requires a >EPR 140W power adaptor, it may not charge with the Thunderbolt 4 connection. • Ensure that you use only the Dell approved adapter or the adapter that comes with the product. • Ensure that the Thunderbolt 4 cable is not damaged.
  • Page 23 6. Trouble Shooting Instructions Problem What you experience Possible solutions The LAN port is Operating system • Ensure that the latest BIOS and drivers not functioning setting or cable for your computer are installed on your connection issue computer. • Ensure that the RealTek 2.5G Ethernet Controller is installed in the Windows Device Manager.
  • Page 24 6. Trouble Shooting Instructions Universal Serial Bus (USB) speci c problems Speci c What you experience Possible solutions Symptoms USB interface is USB peripherals are • Check that your display is turned ON. not working not working • Reconnect the upstream cable to your computer.