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Dell Pro 34 Plus Service Manual
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Dell Pro 34 Plus Service Manual

Dell Pro 34 Plus Service Manual

Usb-c hub monitor
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Dell Pro 34 Plus USB-C Hub Monitor
P3425WE
Service Manual
Model: P3425WE
Regulatory Model: P3425WEb
March 2025
Rev. A00

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Summary of Contents for Dell Pro 34 Plus

  • Page 1 Dell Pro 34 Plus USB-C Hub Monitor P3425WE Service Manual Model: P3425WE Regulatory Model: P3425WEb March 2025 Rev. A00...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2025 Dell Inc. or its subsidiaries. All rights reserved. Dell Technologies, Dell, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners.
  • Page 3 Removing the power board .................................. 33 Installing the power board ..................................34 Chapter 7:Troubleshooting Instructions .....................35 Self-test ..........................................35 Built-in diagnostics ....................................... 36 Common problems ....................................... 37 Product-specific problems ..................................38 Universal Serial Bus (USB) specific problems ............................ 39 Chapter 8:Contacting Dell ........................40...
  • Page 4 Safety Instructions Use the following safety guidelines to protect your monitor from potential damage and to ensure your personal safety. Unless otherwise noted, each procedure included in this document assumes that you have read the safety information that shipped with your monitor.
  • Page 5 Views of P3425WE monitor Side view Figure 1. Side view with monitor stand Views of P3425WE monitor...
  • Page 6 Front view Figure 2. Front view with monitor stand Table 1. Components and descriptions Label Description Power LED indicator A solid white light indicates that the monitor is turned on and is functioning normally. Blinking white light indicates that the monitor is in Standby Mode.
  • Page 7 Lists the regulatory approvals. Stand release button Releases stand from the monitor. Barcode, serial number, and Service Refer to this label if you need to contact Dell for technical support. Tag label Power On/Off button To turn the monitor on or off.
  • Page 8 Bottom view Figure 4. Bottom view without monitor stand Table 3. Components and descriptions Label Description Soundbar slots Attach your external Soundbar (sold separately) to the monitor by aligning the magnetic tabs on the soundbar with the slots on the monitor. Security-lock slot Secures the monitor with a security lock (security lock not included).
  • Page 9 Major components of your monitor Figure 5. Major components Major components of your monitor...
  • Page 10 Components in items 3 to 12 are for EMEA only and not for other regions. 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 11 Wiring connectivity diagram Figure 6. Wiring connectivity diagram Table 5. Cables Item Description Backlight cable (Short) Backlight cable (Long) LVDS cable USB board cable Wiring connectivity diagram...
  • Page 12 NOTE: Dell monitors are designed to work optimally with Dell-supplied inbox cables. Dell does not guarantee the video quality and performance if non-Dell cables are used. To connect your monitor to the computer: 1.
  • Page 13 Connecting USB Type-A to Type-B cable Figure 9. USB Type-A to Type-B cable connection Connecting USB-C to C cable Figure 10. USB-C to C cable connection Connecting the cables...
  • Page 14 Connecting RJ45 (Optional) cable Figure 11. RJ45 cable and USB Type-A to Type-B cable connection Figure 12. RJ45 cable and USB-C to C cable connection Connecting the cables...
  • Page 15 Disassembly and reassembly NOTE: The images in this document may differ from your computer depending on the configuration you ordered. Recommended tools • Phillips screwdriver #0 • Phillips screwdriver #2 • Plastic scribe Screw list NOTE: When removing screws from a component, it is recommended to note the screw type, the quantity of screws, and then place them in a screw storage box.
  • Page 16 Stand Removing the stand Prerequisites 1. Follow the procedure in Before working inside your monitor. NOTE: To prevent the LCD screen from scratches during stand removal, ensure the monitor is positioned on a soft surface and handled carefully. NOTE: The following steps are specifically for removing the stand that is shipped with your monitor. If you are removing a stand that you purchased from any other source, follow the setup instructions that are included with the stand.
  • Page 17 Installing the stand Steps 1. Aline the two tabs on the upper part of the stand to the groove on the back of the display. 2. Press the stand down untill it snaps into place. Figure 14. Installing the stand Next steps 1.
  • Page 18 Back Cover Removing the back cover Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. Steps 1. Remove the four screws (M4x10) that secure the back cover to the chassis assembly. 2. Using the plastic scribe, pry the back cover starting from the edge of the monitor. 3.
  • Page 19 Figure 16. Removing the back cover Disassembly and reassembly...
  • Page 20 Installing the back cover Steps 1. Connect the control board cable to the connector on the interface board. 2. Place and snap the back cover into place on the chassis assembly. NOTE: Align the screw holes on the back cover with the screw holes on the chassis assembly before applying slight pressure to the back cover.
  • Page 21 Figure 18. Installing the back cover Next steps 1. Install the stand. 2. Follow the procedure in After working inside your monitor. Disassembly and reassembly...
  • Page 22 Chassis assembly Removing the chassis assembly Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. 3. Remove the back cover. Steps 1. Disconnect the short backlight cable and long backlight cable from the connectors on the LED driver board. 2.
  • Page 23 Figure 20. Removing the chassis assembly Disassembly and reassembly...
  • Page 24 Installing the chassis assembly Steps 1. Connect the LVDS cable to the connector on the display panel and make sure the LVDS cable is locked properly. 2. Adhere the yellow tape on the LVDS connector. 3. Place the chassis assembly on the display panel. 4.
  • Page 25 Figure 22. Installing the chassis assembly Next steps 1. Install the back cover. 2. Install the stand. 3. Follow the procedure in After working inside your monitor. Disassembly and reassembly...
  • Page 26 LED driver board Removing the LED driver board Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. 3. Remove the back cover. 4. Remove the chassis assembly. Steps 1. Peel the mylar from the chassis assembly. 2.
  • Page 27 Figure 24. Removing the LED driver board Disassembly and reassembly...
  • Page 28 Installing the LED driver board Steps 1. Connect the power cable to the connector on the LED driver board. 2. Align and place the LED driver board to the chassis assembly. 3. Replace the two screws (M3x9) to secure the LED driver board to the chassis assembly. 4.
  • Page 29 Figure 26. Installing the LED driver board Next steps 1. Install the chassis assembly. 2. Install the back cover. 3. Install the stand. 4. Follow the procedure in After working inside your monitor. Disassembly and reassembly...
  • Page 30 Interface board Removing the interface board Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. 3. Remove the back cover. 4. Remove the chassis assembly. 5. Remove the LED driver board. Steps 1. Remove the eight screws (M3x9) from the interface board and power board. 2.
  • Page 31 Figure 28. Removing the interface board Disassembly and reassembly...
  • Page 32 Installing the interface board Steps 1. Connect the power cable and LVDS cable to the connectors on the interface board. 2. Align and place the the power board and interface board to the chassis assembly. 3. Replace the eight screws (M3x9) to secure the power board and interface board with the chassis assembly. Figure 29. ...
  • Page 33 Power board Removing the power board Prerequisites 1. Follow the procedure in Before working inside your monitor. 2. Remove the stand. 3. Remove the back cover. 4. Remove the chassis assembly. 5. Remove the LED driver board. 6. Remove the interface board.
  • Page 34 Installing the power board Steps 1. Connect the power cable to the connectors on the power board. Figure 31. Installing the power board Next steps 1. Install the interface board. 2. Install the LED driver board. 3. Install the chassis assembly. 4.
  • Page 35 Troubleshooting Instructions Warning: Before you begin any of the procedures in this section, follow the Safety 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: Turn off both your computer and the monitor.
  • Page 36 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 prob- lem with your monitor, or with your computer and graphics card. Figure 33. Self-diagnostics in OSD To run the built-in diagnostics: Ensure that the screen is clean (no dust particles on the surface of the screen).
  • Page 37 • A 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 bright •...
  • Page 38 Common symptoms What you experience Possible solutions Intermittent problems Monitor malfunctions on • Ensure that the video cable connecting the monitor to the computer is and off 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.
  • Page 39 Common symptoms What you experience Possible solutions No video at HDMI/ When connected to Unplug the HDMI/DisplayPort/USB-C to C cable from dongle/docking DisplayPort/USB-C port some dongle/docking device, then plug the docking HDMI/DisplayPort/USB-C to C cable into the device at the port, notebook.
  • Page 40 Contacting Dell To contact Dell for sales, technical support, or customer service issues, see www.dell.com/contactdell. NOTE: Availability varies by country and product, and some services may not be available in your country. NOTE: If you do not have an active internet connection, you can find contact information about your purchase invoice, packing slip, bill, or Dell product catalog.

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