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OptiPlex 5400 Service Manual

PDF

Removing the system board

Prerequisites

  1. Follow the procedure in Before working inside your computer.
    NOTE: Your computer’s Service Tag is stored in the system board. You must enter the Service Tag in the BIOS setup program after you replace the system board.
    NOTE: Replacing the system board removes any changes you have made to the BIOS using the BIOS setup program. You must make the appropriate changes again after you replace the system board.
  2. Remove the stand.
  3. Remove the cable cover (optional).
  4. Remove the back cover.
  5. Remove the hard drive.
  6. Remove the system-board shield.
  7. Remove the memory modules.
  8. Remove the wireless card.
  9. Remove the M.2 solid-state drive.
  10. Remove the heat sink.
  11. Remove the processor.
  12. Remove the coin-cell battery.
  13. Remove the bottom cover.
  14. Remove the rear-I/O bracket.

About this task

The following image indicates the connectors on your system board.

Image: System board layout

  1. Power-supply unit (PSU) cable connector
  2. Coin-cell battery
  3. Display back-light cable connector
  4. Camera cable connector
  5. M.2 2230/2280 solid-state drive connector
  6. Processor-fan cable connector
  7. Memory modules
  8. Hard-drive connector
  9. M.2 2230/2280 solid-state drive connector
  10. Side I/O-signal cable connector
  11. Side I/O-power cable connector
  12. Audio-board cable connector
  13. Microphone-module cable connector
  14. Speaker cable connector
  15. Display cable connector
  16. M.2 WLAN connector
  17. PSU-fan cable connector
  18. Touchscreen cable connector
  19. Processor

The following image indicates the location of the system board and provides a visual representation of the removal procedure.

Image: Removing the system board

Image: Removing the system board

Steps

  1. Disconnect the display back-light cable from the connector on the system board.
  2. Disconnect the display cable from the connector on the system board.
  3. Disconnect the PSU cable from the connector on the system board.
  4. Disconnect the PSU fan cable from the connector on the system board.
  5. Open the latch and disconnect the power-button board cable from the connector on the system board.
  6. Disconnect the speaker cable from the connector on the system board.
  7. Disconnect the microphone-module cable from the connector on the system board.
  8. Disconnect the SIO-signal cable from the connector on the system board.
  9. Disconnect the SIO-power cable from the connector on the system board.
  10. Disconnect the audio-board cable from the connector on the system board.
  11. Disconnect the system fan cable from the connector on the system board.
  12. Disconnect the touchscreen cable from the connector on the system board.
  13. Disconnect the camera cable from the connector on the system board.
  14. Remove the nine screws (M3x5) that secure the system board to the display-assembly base.
  15. Lift and remove the system board from the display-assembly base.
    NOTE: For this model, the entire LCD assembly must be replaced in order to ship an LVDS cable.

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