XPS 8940 Service Manual

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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: Before disconnecting the cables from the system board, note the location of the connectors so that you can reconnect the cables correctly after you replace the system board.
    NOTE: Replacing the system board removes any changes that 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 left-side cover.
  3. Remove the front cover.
  4. Remove the 3.5-inch hard drive, if applicable.
  5. Remove the memory modules.
  6. Remove the wireless card.
  7. Remove the solid-state drive/Intel Optane.
  8. Remove the graphics card.
  9. Remove the coin-cell battery.
  10. Remove the processor fan and heat-sink assembly.
  11. Remove the processor.

About this task

Figure 1. System-board components
Image: System-board components
  1. processor power-cable connector (ATX CPU1)
  2. processor power-cable connector (ATX CPU)
  3. processor
  4. processor-fan cable connector (FAN CPU)
  5. memory-module slot (DIMM3)
  6. memory-module slot (DIMM1)
  7. memory-module slot (DIMM4)
  8. memory-module slot (DIMM2)
  9. power-button cable
  10. hard-drive data-cable connector (SATA0)
  11. hard-drive data-cable connector (SATA1)
  12. hard-drive data-cable connector (SATA2)
  13. optical-drive data-cable connector (SATA3)
  14. hard-drive power cable connector (SATA PWR)
  15. solid-state drive connector (m.2 PCIe SSD)
  16. coin-cell battery
  17. wireless-card slot
  18. system-board power-cable connector (ATX SYS)
  19. PCIe x4 slot
  20. PCIe x16 slot
  21. PCIe x1 slot
  22. chassis-fan cable connector (FAN SYS)

The following images indicate the location of the system board and provide a visual representation of the removal procedure.

Image: Removing the system board

Image: Removing the system board

Image: Removing the system board

Image: Removing the system board

Steps

  1. Lay the computer on the right side.
  2. Remove the screw (#6-32) that secures the front I/O-bracket to the chassis.
  3. Rotate and remove the front I/O-bracket from the chassis.
  4. Disconnect all the cables that are connected to the system board.
  5. Remove the eight screws (#6-32) that secure the system board to the chassis.
  6. Remove the voltage regulator heat sink.
    NOTE: The voltage regulator heat sink is shipped as a separate unit and it does not ship along with the system board. If reusing the voltage regulator heat sink, remove it from the old system board and transfer it to the new system board.
  7. Remove the screw (#6-32x3.8) and that secures the system board to the chassis.
  8. Lift the system board at an angle and remove it off the chassis.

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