Dell 34 Plus Simplified Service Manual
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Dell 34 Plus Simplified Service Manual

Dell 34 Plus Simplified Service Manual

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Dell 34 Plus 4K Monitor
S3425DW
Simplified Service Manual
Model: S3425DW
Regulatory Model: S3425DWc
March 2025
Rev. A00

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  • Page 1 Dell 34 Plus 4K Monitor S3425DW Simplified Service Manual Model: S3425DW Regulatory Model: S3425DWc March 2025 Rev. A00...

  • Page 2: Notes, Cautions, And Warnings

    A WARNING indicates a potential for property damage, personal injury, or death. Copyright © 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: Table Of Contents

    Contents Safety instructions ..............5 Before working inside your monitor .
  • Page 4 Contacting Dell ........

  • Page 5: Safety Instructions

    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 is shipped with your monitor.

  • Page 6: Views Of S3425Dw Monitor

    Views of S3425DW monitor Front view Figure 1. Front view of the monitor Table 1. Front view of the monitor. Description Power LED indicator Solid white light indicates that the monitor is turned on and functioning normally. Blinking white light indicates that the monitor is in Standby Mode.

  • Page 7: Back View

    Lists the regulatory approvals. Regulatory label (including MyDell QR See this label if you need to contact Dell for technical support. The code, serial number, and Service Tag label) Service Tag is a unique alphanumeric identifier that enables Dell service technicians to identify the hardware components in your monitor and access warranty information.

  • Page 8: Bottom View

    Bottom view Figure 4. Bottom view of the monitor Table 3. Bottom view of the monitor. Description Connect your USB device or charge your device. USB 5Gbps Type-A downstream port NOTE: To use these ports, you must connect the USB-C cable (shipped with your monitor) to the USB-C upstream port on the monitor and to your computer.

  • Page 9: Major Components Of S3425Dw

    Major components of S3425DW Figure 5. Major components of S3425DW Major components of S3425DW...
  • Page 10 Middle frame Front trim Display panel Note For replacement of power cable, connectivity cable and external power supply (if applicable), contact Dell: 1. Go to Dell Support Site. 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

    Wiring connectivity diagram 1 2 3 Figure 6. Wiring connectivity diagram Table 5. Wire connectivity diagram. Description Speaker cable Keypad board cable System board-power board cable Power board cable Lightbar cable Wiring connectivity diagram...

  • Page 12: Connecting The Cables

    Safety instructions. NOTE: Dell monitors are designed to work optimally with the Dell-supplied cables inside the box. Dell does not guarantee the video quality and performance if non-Dell cables are used. NOTE: Route the cables through the cable management guide before connecting them.

  • Page 13: Routing The Cable To Side I/O (Optional)

    Routing the cable to side I/O (optional) Figure 10. Routing the cable to side I/O To route the cable to the side I/O: 1. Insert the HDMI cable (purchased separately) and USB cable (purchased separately) into the side I/O connector. 2.

  • Page 14: Disassembly And Reassembly

    Disassembly and reassembly CAUTION: The information in this section is intended for authorized service technicians in the EMEA region. Dell prohibits users from disassembling the monitor, and any damage caused by unauthorized servicing will not be covered under the warranty.
  • Page 15 Component Screw types Quantity Screw images M3x6 USB board M3x4 Keypad board Q2x2.5 Disassembly and reassembly...

  • Page 16: Stand

    Stand Removing the stand Prerequisites Follow the procedure in Before working inside your monitor. About the task The following image indicates the location of the stand and provides a visual representation of the removal procedure. Figure 13. Removing the stand Steps Place the monitor on a clean, flat surface on a soft cloth or cushion.
  • Page 17 Figure 14. Installing the stand Steps Align and insert the stand riser into the stand base until it snaps into place. Open the screw handle at the bottom of the stand base and turn it clockwise to secure the stand assembly. Close the screw handle.

  • Page 18: Back Cover

    Back cover Removing the back cover Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. About the task The following image indicates the location of the back cover and provides a visual representation of the removal procedure. M4x10 Figure 15.
  • Page 19 Figure 16. Disconnect the keypad board and Lens board cables Steps Remove the four screws (M4x10) that secure the back cover to the chassis. Using a plastic scribe, pry the back cover starting from the bottom edge of the monitor. Lift the back cover partially from the right side and disconnect the keypad board cable and Lens board cable from the connectors on the keypad board.

  • Page 20: Installing The Back Cover

    Installing the back cover Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the back cover and provides a visual representation of the installation procedure. Figure 17.
  • Page 21 M4x10 Figure 18. Replace the screws Steps Connect the keypad board cable and Lens board cable to the connectors on the keypad board. Align the screw holes on the back cover with the screw holes on the monitor, and gently press along the sides to snap the back cover into place.

  • Page 22: Speaker

    Speaker Removing the speaker Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. About the task The following image indicates the location of the speaker and provides a visual representation of the removal procedure. Figure 19.
  • Page 23 M3x6 Figure 20. Removing the screws and disconnect the speaker cable Steps Peel back the tapes that secure the cables and metal shield to the display panel. Remove the six screws (M3x6) that secure the speakers to the middle frame. Disconnect the speaker cable from the connector on the system board.

  • Page 24: Installing The Speaker

    Installing the speaker Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the speaker and provides a visual representation of the installation procedure. M3x6 Figure 21.
  • Page 25 Figure 22. Adhere the tapes to secure the cables and metal shield Steps Align and place the speakers in the slots on the chassis. Connect the speaker cable to the connector on the system board. Align the screw holes on the speakers with the screw holes on the middle frame. Replace the six screws (M3x6) to secure the speakers to the middle frame.

  • Page 26: Metal Shield

    Metal shield Removing the metal shield Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the speaker. About the task The following image indicates the location of the metal shield and provides a visual representation of the removal procedure. M3x4 Figure 23.
  • Page 27 Figure 24. Disconnecting the display cables Steps Disconnect the keypad board cable, system board cable, power board cable, and lightbar cable from the connectors on the system board and the display panel. Remove the six screws (M3x4) that secure the metal shield to the middle frame. Lift the metal shield partially and disconnect the display cable from the connector on the display panel.

  • Page 28: Installing The Metal Shield

    Installing the metal shield Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the metal shield and provides a visual representation of the installation procedure. Figure 25.
  • Page 29 M3x4 Figure 26. Replacing the screws and disconnecting the cables Steps Connect the display cables to the connectors on the display panel and lay down the metal shield. Align the screw holes of the metal shield to the screw holes on the display panel. Replace the six screws (M3x4) to secure the metal shield to the display panel.

  • Page 30: System Board And Power Board

    System board and power board Removing the system board and power board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the speaker. Remove the metal shield. About the task The following image indicates the location of the system board, power board and provides a visual representation of the removal procedure.
  • Page 31 D3x6 M4x6 Figure 29. Removing the screws Figure 30. Disconnecting the cables Disassembly and reassembly...

  • Page 32: Installing The System Board And Power Board

    Steps Remove the Mylar sheet from the system board and the power board. Remove the metal shield I/O-cover from the metal shield. Remove the twelve screws (D3x6) and the screw (M4x6) that secure the system board, power board, and converter board to the metal shield.
  • Page 33 D3x6 M4x6 Figure 32. Replace the screws Figure 33. Replace the metal shield I/O-cover Disassembly and reassembly...
  • Page 34 Figure 34. Installing the Mylar Steps Connect the cables to the connectors on the system board, power board, and converter board. Replace the twelve screws (D3x6) and the screw (M4x6) to secure the system board, power board, and converter board to the metal shield.

  • Page 35: Middle Frame

    Middle frame Removing the middle frame Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the speaker. Remove the metal shield. About the task The following image indicates the location of the middle frame and provides a visual representation of the removal procedure. M2x2 M3x4 Figure 35.

  • Page 36: Installing The Middle Frame

    Installing the middle frame Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the middle frame and provides a visual representation of the installation procedure. M3x4 M2x2 Figure 36.

  • Page 37: Lens Board

    Lens board Removing the Lens board Prerequisites Follow the procedure in Before working inside your monitor. Remove the stand. Remove the back cover. Remove the speaker. Remove the metal shield. Remove the middle frame. About the task The following image indicates the location of the Lens board and provides a visual representation of the removal procedure. Q2x2.5 Figure 37.

  • Page 38: Installing The Lens Board

    Installing the Lens board Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the Lens board and provides a visual representation of the installation procedure. Q2x2.5 Figure 38.
  • Page 39 M3x6 M3x4 Figure 39. Removing the USB board Steps Remove the two screws (M3x6) and the screw (M3x4) that secure the USB board to the middle frame. Disassembly and reassembly...

  • Page 40: Installing The Usb Board

    Installing the USB board Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the USB board and provides a visual representation of the installation procedure. M3x6 M3x4 Figure 40.

  • Page 41: Keypad Board

    Steps Replace the screw (M3x4) and the two screws (M3x6) that secure the USB board to the middle frame. Next steps Install the middle frame. Install the metal shield. Install the speaker. Install the back cover. Install the stand. Follow the procedure in After working inside your monitor.

  • Page 42: Installing The Keypad Board

    Steps Remove the three screws (Q2X2.5) that secure the keypad board to the back cover. Lift the keypad board away from the back cover. Installing the keypad board Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following image indicates the location of the keypad board and provides a visual representation of the installation procedure.

  • Page 43: Troubleshooting

    Troubleshooting 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: 1.

  • Page 44: Built-In Diagnostics

    Built-in diagnostics Your monitor includes a built-in diagnostic tool to help you identify whether the screen abnormality is due to an issue with the monitor itself or with your computer and video card. To run the built-in diagnostics: 1. Ensure that the screen is clean (no dust particles on the surface of the screen). 2.

  • Page 45: Common Problems

    Cycle power On-Off. Pixel that is permanently off is a natural defect that can occur in LCD • technology. For more information about Dell Monitor Quality and Pixel Policy, see • www.dell.com/pixelguidelines. Stuck-on pixels LCD screen has bright spots •...
  • Page 46 Common symptoms What you experience Possible solutions Intermittent problems Monitor malfunctions on Ensure that the video cable connecting the monitor to the computer • and off is connected properly and is secure. Reset the monitor to factory settings (Factory Reset). •...

  • Page 47: Universal Serial Bus (Usb) Specific Problems

    Universal Serial Bus (USB) specific problems Common symptoms What you experience Possible solutions USB interface is not USB peripherals are not • Check that your monitor is turned on. working working • Reconnect the upstream cable to your computer. • Reconnect the USB peripherals (downstream port). •...

  • Page 48: Regulatory Information

    Regulatory information FCC notices (U.S. Only) and other regulatory information For FCC notices and other regulatory information, see the regulatory compliance website at www.dell.com/regulatory_compliance. EU product database for energy label and product information sheet S3425DW: https://eprel.ec.europa.eu/qr/2200407 Regulatory information...

  • Page 49: Contacting Dell

    Contacting Dell To contact Dell for sales, technical support, or customer service issues, see www.dell.com/contactdell. NOTE: Availability varies by country, region, or 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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