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Remove the system board

Use this information to remove the system board.

About this task

  • Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.

  • Turn off the corresponding DWC tray that you are going to perform the task on.

  • Disconnect all external cables from the enclosure.

  • Use extra force to disconnect QSFP cables if they are connected to the solution.

  • To avoid damaging the water loop, always use the water loop carrier when removing, installing or folding the water loop.


Ensure you have SD650 V3 Neptune DWC Waterloop Service Kit in hand to install components.

Prepare the following screwdrivers to ensure you can install and remove corresponding screws properly.
Screwdriver TypeScrew Type
Torx T10 head screwdriverTorx T10 screw
Torx T30 head screwdriverTorx T30 screw
Phillips #1 head screwdriverPhillips #1 screw
Phillips #2 head screwdriverPhillips #2 screw
Watch the procedure
  • A video of this procedure is available at YouTube.


  1. Make preparations for this task.
    1. Remove the tray from the enclosure. See Remove a DWC tray from the enclosure.
    2. Remove the tray cover. See Remove the tray cover.
    3. Remove the cross braces. See Remove the cross braces.
    4. Remove the DIMM comb. See Remove a DIMM comb.
    5. Remove memory modules. See Remove a memory module.
    6. Remove the M.2 backplane assembly. See Remove the M.2 backplane assembly.
    7. Remove the drive cage. See Remove a drive cage assembly.
    8. Remove the PCIe riser assembly. Depending on your configuration, see Remove a PCIe riser assembly (ConnectX-6), PCIe riser assembly replacement (ConnectX-7 NDR 200), or Remove a PCIe riser assembly (ConnectX-7 NDR 400).
    9. Remove the power distribution board, and carefully rotate the water loop so one half is sitting on top of the other half. See Remove the power distribution board.
  2. Remove the two Torx T10 screws (per node) to remove the VR water loop trough out of the system board.
    Figure 1. VR water loop trough removal
    VR water loop trough removal
  3. Remove seven Phillips #1 screws per node on the system board (with a torque screwdriver set to the proper torque).
    Figure 2. System board screws removal
    System board screws removal
    For reference, the torque required for the screws to be fully tightened/removed is 0.5-0.6 newton-meters, 4.5-5.5 inch-pounds.
  4. Carefully hold the guide pin and tilt the system board at an angle; then, gently slide and lift the system board backwards to remove the system board from the node.
    Avoid touching the connectors on the system board. Be careful not to damage any surrounding components inside the node.
    Figure 3. System board removal
    System board removal

If you are instructed to return the component or optional device, follow all packaging instructions, and use any packaging materials for shipping that are supplied to you.

Before you return the system board, make sure that you install the processor socket dust covers from the new system board. To replace a processor socket dust cover:
  1. Take a dust cover from the processor socket assembly on the new system board and orient it correctly above the processor socket assembly on the removed system board.

  2. Gently press down the dust cover legs to the processor socket assembly, pressing on the edges to avoid damage to the socket pins. You might hear a click on the dust cover is securely attached.

  3. Make sure that the dust cover is securely attached to the processor socket assembly.

If you need to disassemble the system board, follow the instructions below:
You can only disassemble the system board for recycle. Do not disassemble it for any other purposes.
  1. Remove the guide pin out of the system board.

    Figure 4. Guide pin removal
    Guide pin removal
  2. Recycle the unit in compliance with local regulations.