Dell U4021QW Service Manual
  1. Manuals
  2. Brands
  3. Dell Manuals
  4. Monitor
  5. U4021QW
  6. Service manual

Dell U4021QW Service Manual

Hide thumbs Also See for U4021QW:
Table of Contents

Advertisement

Quick Links

Download this manual
Service Manual - U4021QW
Version: 01
Date: 2021/10/30

Advertisement

Table of Contents
loading

Related Manuals for Dell U4021QW

Summary of Contents for Dell U4021QW

  • Page 1 Service Manual - U4021QW Version: 01 Date: 2021/10/30...

  • Page 2: Important Safety Notice

    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...
  • 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: Disassembly And Assembly Procedures

    This “Disassembly and Assembly Procedures” is for EMEA only, joystick cable away from the connector, and tear off not for other regions. Please note that Dell will deem warranty void 1pcs aluminum foil, and then remove the rear cover. if any disassembly is done on the monitors.
  • Page 8 5. Disassembly and Assembly Procedures Tear off 2pcs aluminum foil for releasing the panel lamp cable, and then u se a Philips-head screwdriver to remove 5pcs screws for unlocking the bracket chassis module with the panel se a Philips-head screwdriver to remove 2pcs screws for unlocking the heat-sink with the board.
  • Page 9 5. Disassembly and Assembly Procedures Tear off 2pcs shading tapes, and then disconnect the panel lamp cable from the two connectors of the panel module. Remove the LED driver board, interface board abd power board from the bracket chassis module carefully, and then disconnect all of the cables.
  • Page 10 No.2~8 screw size=M4x8, Torque=7.5 kgfxcm) ±0.5 Take 1pcs Dell nameplate, then use a locating fixture to fix the nameplate to the front bezel of the module, and then move the whole unit into a laminating fixture, use the laminating fixture to press the nameplate with the front bezel of the panel module firmly attachment.
  • Page 11 5. Disassembly and Assembly Procedures Adjust the bracket chassis module, and then u se a Turn over the panel module to place screen faced Philips-head screwdriver to tighten 5pcs screws for down. Paste 2pcs shading tape on the top side of the locking the bracket chassis module with the panel panel connectors as the picture below shown, then tighten 2pcs screws for locking the heat-sink with the...
  • Page 12 5. Disassembly and Assembly Procedures Take 1pcs USB board, 1pcs conductive foam, 1pcs FFC cable and 1pcs EDP cable. Connect the two Assemble the middle bezel unit with the panel cables to the connectors of the USB board, then module, and then connect the LED cable to the paste 1pcs conductive foam on the back of the USB connector of the circuit board.
  • Page 13 5. Disassembly and Assembly Procedures Take a stand base close to the monitor. Fit the two tabs on the upper part of the stand into the grooves on the back of the monitor, and then lower the stand so that the monitor mounting area snaps onto the stand. Paste 1pcs aluminum foil to cover the connectors Use a protective bag to pack the stand base, then lift as the picture below shown, then move the...

  • Page 14: Troubleshooting Instructions

    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/U4021QW No HDMI 1 Cable The display will go into Standby Mode in 4 minutes. www.dell.com/U4021QW No HDMI 2 Cable The display will go into Standby Mode in 4 minutes.

  • Page 15: 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. Preset Modes To run the built-in diagnostics: 1.
  • Page 16 Missing Pixels LCD screen has • Cycle power on-off. spots • 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/pixelguidelines. Stuck-on Pixels LCD screen has • Cycle power On-Off. bright spots • 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: www.dell.com/pixelguidelines.

  • Page 17: Product Specific Problems

    6. Trouble Shooting Instructions Product specific problems NOTE: Thunderbolt is not supported Windows 7. Problem What you Possible solutions experience Screen image is Image is • Check the Aspect Ratio setting in the Display too small centered on menu OSD. screen, but • Reset the monitor to factory settings.
  • Page 18 6. Trouble Shooting Instructions Problem What you Possible solutions experience Black screen on Black screen • Graphic Card Driver not able to support Chrome OS @ after switch resolution 4096 x 2160. HDMI port on PBP mode • Switch to PBP 75/25 or 50/50 80/20 No Display No Display...
  • Page 19 • If the Notebook requires a >90 W power adaptor, laptop, and so it may not charge with the Thunderbolt connection. • Ensure that you use only Dell approved adapter or the adapter that comes with the product. • Ensure that the Thunderbolt 4 (USB Type-C) active cable is not damaged.

  • Page 20: Universal Serial Bus (Usb) Specific Problems

    6. Trouble Shooting Instructions Problem What you Possible solutions experience The LAN port is OS setting • Ensure that the latest BIOS and drivers for your not functioning or cable computer are installed on your computer. connection • Ensure that the RealTek Gigabit Ethernet issue Controller is installed in the Windows Device Manager.
  • Page 21 6. Trouble Shooting Instructions Specific What You Possible Solutions Symptoms Experience USB Type-C USB peripherals • Check that the connected device is compliant port does not can not be with the USB-C specification. The USB Type-C supply power charged port supports USB 2.0 and an output of 90 W. • Check that you use the USB Type-C cable shipped with your monitor.

Table of Contents