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Remove the power distribution board

Use this information to remove the power distribution board.

About this task

Required tools

Make sure you have the required tools listed below in hand to properly replace the component.

  • SD665 V3 Water Loop Service Kit (The water loop carrier in the Service Kit is reusable, it is recommended to keep it at the facility where the server operates for future replacement needs.)

  • SD665 V3 Water Loop Putty Pad Kit

    Putty pad cannot be reused. Whenever the water loop is removed, putty pads must be replaced with new ones before reinstalling the water loop.

  • Drive gap pad or putty pad kits according to the drives installed in the tray. See their respective replacement procedures for more information.

  • ConnectX series adapter putty pad kits according to the ConnectX adapter installed in the tray. See their respective replacement procedures for more information.

  • Screws and screwdrivers

    Prepare the following screwdrivers to ensure you can install and remove corresponding screws properly.
    Screwdriver TypeScrew Type
    Torx T10 head screwdriverTorx T10 screw
    Torx T20 head screwdriverTorx T20 screw
    Phillips #2 head screwdriverPhillips #2 screw
    3/16" hex head screwdriverM3 screw
Attention

  • 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.

Procedure

Note
Depending on the model, your solution might look slightly different from the illustration.

  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 M.2 backplane assembly. See Remove the M.2 backplane assembly.
      Note
      The M.2 backplane cold plate needs to be removed as well.
    5. Remove the drive cage. See Remove a drive cage assembly.
    6. Remove the PCIe riser assembly. Depending on your configuration, see Remove a PCIe riser assembly (ConnectX-6), Remove a PCIe riser assembly (ConnectX-7 NDR 200), or Remove a PCIe riser assembly (ConnectX-7 NDR 400).
  2. Remove the five screws to loosen the quick connect.
    Figure 1. Quick connect screw removal
    Quick connect screw removal
  3. Remove water loop screws and quick connect screws (14x Torx T10 screws per node) with a torque screwdriver set to the proper torque.
    Note

    • For reference, the torque required for the screws to be fully tightened/removed is 5.0+/- 0.5 lbf-in, 0.55+/- 0.05 N-M.

    • When removing the 1 VR cold plate screws (x2), remove the washers, too. Make sure to keep the washers for future use. (Depending on the configurations, there may not be any washers on the VR cold plate. In this case, there is no need to remove and keep the washers.)

      Figure 2. VR cold plate screws with washers
      VR cold plate screws with washer
    Figure 3. Water loop screw removal
    Water loop screw removal
  4. Orient the water loop carrier with the guide pin; then, gently put the water loop carrier down and ensure it is seated firmly on the water loop.
    Figure 4. Water loop carrier installation
    Water loop carrier installation
  5. Tighten water loop carrier screws (12x Phillips #2 screws per node).
    Note
    The screw holes on the rear of the carrier are marked with L and R. Select screw holes marked as L when the carrier is on the left node, and R for the right node.
    Figure 5. Water loop carrier screws installation
    Water loop carrier screws installation
  6. Remove processor cold plate screws (12x Torx T20 screws per node). Follow the screw sequence specified on the processor cold plate label and loosen the screws with a general screwdriver torque screwdriver. Fully loosen each screw; then, proceed to the next screw.
    Note
    For reference, the torque required for the screws to be fully tightened/removed is 1.12-1.46 newton-meters, 10-13 inch-pounds
    Figure 6. Processor cold plate label

    Fully loosen each screw in this order: 6 > 5 > 4 > 3 > 2 > 1


    Processor cold plate label
    Figure 7. Processor cold plate removal
    Processor cold plate removal
  7. Rotate the latches on the water loop carrier to separate the processor cold plates from processors.
    Figure 8. Separate water loop from processor
    Separate water loop from processor
  8. Carefully rotate the water loop so one half is sitting on top of the other half.
    Note

    Do not tilt the water loop. Keep the water loop horizontal with the tray.

    Figure 9. Folding the water loop
    Folding the water loop
  9. Remove the power distribution board.
    1. Remove the five M3 screws (per node) with a 3/16" hex head screwdriver.
    2. Gently pull the power distribution board connector to disconnect it from the system board.
    3. Carefully pull the power distribution board inwards to disengage it from the node.
    Note

    Use a 3/16" hex head screwdriver to ensure the proper removal and installation.

    Figure 10. Power distribution board removal
    Power distribution board removal
  10. Wipe the thermal grease from the top of the processors with an alcohol cleaning pad.
  11. Wipe the thermal grease from the bottom of the cold plate with an alcohol cleaning pad.
After you finish

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.

Demo video

Watch the procedure on YouTube