Skip to main content

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.

  • Water loop kits

    • SD650-N V3 Water Loop Gap Pad 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.)

    • SD650-N V3 Water Loop Putty Pad Kit

    • SD650-N V3 OSFP Putty Pad Kit

    • VR Conduction Plate Parts

  • Drive gap pad or putty pad kits according to the drives 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
    Hex screw4.5 mm hex head screwdriver
    3/16" hex head screwdriverhex head screwdriver (power distribution board)
    Torx T10 head screwdriverTorx T10 screw
    Torx T30 head screwdriverTorx T30 screw
    Phillips #1 head screwdriverPhillips #1 screw
    Phillips #2 head screwdriverPhillips #2 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.

Watch the procedure
  • A video of this procedure is available at YouTube.

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 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.
      Note
      The M.2 backplane cold plate needs to be removed as well.
    7. Remove the bus bar. See Remove the bus bar.
    8. Remove the MCIO cables. Follow the guidance and routing information in Internal cable routing.
    9. Remove the drive cage. Depending the system configurations, see Remove a drive cage assembly, Remove a 7mm NVMe drive cage assembly, or Remove the E3.S drive cage assembly.
    10. Remove the OSFP module. See Remove the OSFP module.
  2. Remove the two Hex screws from the OSFP module with a 4.5 mm hex head screwdriver.
    Figure 1. OSFP module conduction plate Hex screws removal
    OSFP module conduction plate Hex screws removal
  3. Remove the OSFP module conduction plate. With alcohol cleaning pads, wipe of any remaining putty pads from the conduction plate.
    Screw TypeScrewdriver Type
    1 M3x5 screw (x3)Phillips #1 head screwdriver
    2 M3 screw (x2)T10 screwdriver
    Figure 2. OSFP module conduction plate removal
    Removing the OSFP module conduction plate
  4. Remove two Torx T10 screws (per node); then, remove the VR (voltage regulator) clamp plate out of the node.
    Figure 3. VR clamp plate removal
    VR clamp plate removal
  5. Remove water loop screws (x9 Torx T10 screws for two nodes) 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 4. Water loop screw removal
    Water loop screw removal
  6. Remove Torx T10 screws (x7 screws) to loosen the quick connect.
    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 5. Quick connect screw removal (Compute node)

  7. Orient two water loop carriers with the guide pins; then, gently put the two water loop carriers down and ensure they are seated firmly on the water loop.
    Figure 6. Water loop carrier installation
    Water loop carrier installation
  8. Tighten water loop carrier screws (x12 Phillips #2 screws).
    Figure 7. Water loop carrier screws installation
    Water loop carrier screws installation
  9. Loosen processors properly.
    1. Fully loosen all Torx T30 captive screws (x8 Torx T30 captive screws) on cold plates with a general screwdriver, following the removal sequence shown on the cold plate label.
      Note
      For reference, the torque required for the screws to be fully tightened/removed is 10+/- 2.0 lbf-in, 1.1+/- 0.2 N-m.
      Attention
      To prevent damage to components, make sure that you follow the indicated loosening sequence.
    2. Rotate all anti-tilt wire bails (16x anti-tilt wire bails for two nodes) inwards to the unlocked position.

      Figure 8. Loosening Torx T30 captive screws
      Loosening Torx T30 captive screws
  10. 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
  11. Remove the power distribution board.
    1. Remove the five Phillips #1 screws (per node).
    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
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.