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Remove the GPU power distribution board

Use this information to remove the GPU power distribution board. This procedure is trained technician only.

About this task

Required tools

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

  • Water loop kits

    • SD650-I V3 Water loop service kit (03KH870)

    • SD650-I V3 Water loop putty pad kit (03LD670)

  • 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
    Phillips #1 head screwdriverPhillips #1 screw
    Phillips #2 head screwdriverPhillips #2 screw
CAUTION

SD650-I V3 GPU power distribution board handling guidelines

When handling the GPU power distribution board, MAKE SURE to follow the following guidelines:

  • Gently handle the power distribution board with care; do not apply extra force to the board.

  • Place the GPU power distribution board upside down on a flat surface when you are not holding it.

  • Discard any GPU power distribution board that has been dropped.

  • MAKE SURE to hold the power connectors and the power cable connectors when handling the GPU power distribution board, as shown below. DO NOT touch anywhere else of the power distribution board.
    Figure 1. SD650-I V3 GPU power distribution board touch points
    SD650-I V3 GPU power distribution board touch points
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

  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. Disconnect the cables from the tray. For power cables, press the latch on the cable connectors. See GPU node cable routing.
  2. Remove the following screws to loosen the quick connect.

    • Two Torx T10 screws to loosen the quick connect.

    • Four Torx T10 screws on the rear of the node.

    Figure 2. Quick connect screw removal
    Quick connect screw removal
  3. Remove fourteen Torx T10 water loop screws 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.
    Figure 3. Water loop screws removal
    Water loop screws removal
  4. Remove GPU OAM cold plate screws (16x Torx T15 screws) with a torque screwdriver set to the proper torque.
    Note
    For reference, the torque required for the screws to be fully tightened/removed is 0.9 +/-0.06 newton-meters, 8+/- 0.5 inch-pounds. The rpm setting is 200 rpm low-speed.
    Figure 4. GPU OAM cold plate screws removal
    GPU OAM cold plate screws removal
  5. Release the interface plate with a flat head screwdriver.
    1. There are two notches on the sides of each GPU OAM cold plate for inserting a flat head screwdriver—select the one that is accessible for the flat head screwdriver.
      Figure 5. Notches on GPU OAM cold plate
      Notches on GPU OAM cold plate
      1 Notches
    2. Insert a flat screwdriver into the notch; then, slightly rotate the screwdriver to release the GPU OAM cold plate from the GPU OAM.
    3. Perform Step B on every GPU OAM cold plate to make sure they are all released from GPU OAM.
      Figure 6. Release the GPU OAM cold plate from the GPU OAM
      Release the GPU OAM cold plate from the GPU OAM
  6. Orient the water loop carrier with the slots; then, gently put the water loop carrier down and ensure it is seated firmly on the water loop.
    Figure 7. Water loop carrier installation
    Water loop carrier installation
  7. Tighten water loop carrier screws (19x Phillips #2 screws).
    Figure 8. Water loop carrier screws installation
    Water loop carrier screws installation
  8. Carefully rotate the water loop so one half is sitting on top of the other half.
    Figure 9. Folding the water loop
    Folding the water loop
  9. Remove the five screws.
    Figure 10. Screws removal
    Screws removal
  10. Remove the GPU power distribution board out of the node.
    Note
    When handling the GPU power distribution board, make sure to follow SD650-I V3 GPU power distribution board handling guidelines.
    Figure 11. GPU power distribution board removal
    GPU power distribution board removal
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.