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OptiPlex 7490 All-In-One Service Manual

PDF

Installing the system 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 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/Intel Optane PCIe connector
  6. Processor-fan cable connector
  7. Memory modules
  8. Hard-drive connector
  9. M.2 2230/2280 solid-state drive PCIe connector
  10. SIO-signal cable connector
  11. SIO-power cable connector
  12. Audio-board cable connector
  13. Microphone-module cable connector
  14. Speaker cable connector
  15. Power-button cable connector
  16. Display cable connector
  17. M.2 WLAN connector
  18. PSU-fan cable connector
  19. Touchscreen cable connector
  20. Processor

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

Image: Installing the system board

Steps

  1. Align the screw holes on the system board with the screw holes on the display-assembly base.
  2. Replace the nine screws (M3x5) to secure the system board to the display-assembly base.
  3. Connect the camera cable to the connector system board.
  4. Connect the touchscreen cable to the system board.
  5. Connect the system fan cable to the system board.
  6. Connect the audio-board cable to the system board.
  7. Connect the SIO-power cable to the system board.
  8. Connect the SIO-signal cable to the system board.
  9. Connect the microphone-module cable to the system board.
  10. Connect the speaker cable to the system board.
  11. Connect the power-button board cable to the system board and close the latch to secure the cable.
  12. Connect the PSU-fan cable to the system board.
  13. Connect the PSU cable to the system board.
  14. Connect the display cable to the system board.
  15. Connect the display back-light cable to the system board.
    NOTE Ensure the display back-light cable is routed under the system board and not to the side of the system board to avoid the cable getting caught between the system board and the camera. This damages the cable, and the camera may not lock in a closed position.

Next steps

  1. Install the rear-I/O bracket.
  2. Install the bottom cover.
  3. Install the coin-cell battery.
  4. Install the processor.
  5. Install the heat sink.
  6. Install the M.2 2280 solid-state drive/Intel Optane memory.
  7. Install the M.2 2230 solid-state drive.
  8. Install the wireless card.
  9. Install the memory modules.
  10. Install the system-board shield.
  11. Install the hard drive.
  12. Install the back cover.
  13. Install the cable cover (optional).
  14. Install the stand.
  15. Follow the procedure in After 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.

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