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Remove the rear H100/H200 GPU cold plate module

Follow instructions in this section to remove the rear H100/H200 GPU cold plate module. The procedure must be executed by a trained technician.

About this task

Attention
  • Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.
  • Power off the server and peripheral devices and disconnect the power cords and all external cables. See Power off the server.
  • If the server is installed in a rack, slide the server out on its rack slide rails to gain access to the top cover, or remove the chassis from the rack. See Remove the server from rack.
  • Two people and one lifting device on site that can support up to 400 lb (181 kg) are required to perform this procedure. If you do not already have a lifting device available, Lenovo offers the Genie Lift GL-8 material lift that can be purchased at Data Center Solution Configurator. Make sure to include the Foot-release brake and the Load Platform when ordering the Genie Lift GL-8 material lift.
  • A torque screwdriver is available for request if you do not have one at hand.
Note
Make sure you have the required tools listed below available to properly replace the component:
  • Torx T10 head screwdriver
  • Torx T15 head screwdriver
  • Phillips #1 head screwdriver
  • Phillips #2 head screwdriver
  • Flat head screwdriver
  • Alcohol cleaning pad
  • H100/H200 PCM Kit
  • SR780a V3 water loop putty pad kit
  • SR780a V3 water loop service kit
Important
Putty pad/phase change material (PCM) replacement guidelines
  • Before replacing the putty pad/PCM, gently clean the hardware surface with an alcohol cleaning pad.
  • Hold the putty pad/PCM carefully to avoid deformation. Make sure no screw hole or opening is blocked by the putty pad/PCM.
  • Do not use expired putty pad/PCM. Check the expiry date on putty pad/PCM package. If the putty pads/PCM are expired, acquire new ones to properly replace them.
The following illustration shows the GPU numbering and corresponding slot numbering in XCC.
Figure 1. GPU numbering
GPU numbering
The following illustration shows the components for rear H100/H200 GPU cold plate module.
Figure 2. rear H100/H200 GPU cold plate module components identification
rear H100/H200 GPU cold plate module components identification
Table 1. rear H100/H200 GPU cold plate module components
1 Manifold2 Hose tie
3 leakage sensor module4 Shipping bracket
5 GPU cold plate6 GPU slot number label
7 GPU cold plate screw torque label 

Procedure

  1. Make preparation for this task.
    1. Remove the front top cover. See Remove the front top cover.
    2. Remove the rear top cover. See Remove the rear top cover.
    3. Remove the fan cage. See Remove the fan cage (trained technician only).
    4. Remove the CPU complex. See Remove the CPU complex.
    5. Remove the power complex. See Remove the power complex.
    6. Disconnect the cables and remove them from the GPU complex if necessary. Before disconnecting the cables, make a list of each cable and record the connectors the cable is connected to. Refer to Internal cable routing.
  2. The following illustration shows the hose holder location.
    Figure 3. Hose holder location
    Hose holder location
  3. Remove the rear fan cage support bracket.
    1. Unfasten the eight M3 screws that secure the rear fan cage support bracket to the the chassis.
    2. Unfasten the four M3 screws that secure the rear fan cage support bracket to the fan cage.
    3. Grasp the rear fan cage support bracket to lift it from the fan cage.
    Figure 4. Removing the rear fan cage support bracket
    Removing the hose cover
  4. Follow the screw sequence specified on the cold plate label, and fully loosen the sixteen Torx T10 screws with a torque screwdriver set to the proper torque.
    Note
    • Loosen or tighten the screws with a torque screwdriver set to the proper torque. For reference, the torque required for the screws to be fully loosen or tighten is 0.4±0.05 newton-meter, 3.5±0.5 pound-inch.
    • Ensure the captive screws are completely loosen before removing the cold plate module.
    Figure 5. Removing the GPU cold plates
    Removing the GPU cold plates
    Note
    If necessary, use a flat screwdriver to gently separate the cold plate and the GPU from the corner of the cold plate. Ensure not the damage the GPU or the cold plate.
  5. Unfasten the four M3 screws (W7-W8) that secure the rear H100/H200 GPU cold plate module manifold to the chassis.
    Figure 6. Removing the rear H100/H200 GPU cold plate module manifold
    Removing the rear H100/H200 GPU cold plate module manifold
  6. Reposition the rear H100/H200 GPU cold plate module manifold as illustrated.
    1. Disengage the manifold from the guide pins marked with B; then, move the manifold to the guide pins marked with A.
    2. Ensure the guide slots on the manifold are securely engaged with the guide pins marked with A.
      Figure 7. Repositioning the rear H100/H200 GPU cold plate module manifold
      Repositioning the rear H100/H200 GPU cold plate module manifold
  7. Align the guide pins on the shipping brackets with the guide holes on the manifold and the cold plates; then, lower the shipping brackets onto the rear H100/H200 GPU cold plate module. Tighten the six captive screws (PH1, 6 x M3, 0.5 newton-meters, 4.3 inch-pound) to secure the shipping brackets to the rear H100/H200 GPU cold plate module.
    Figure 8. Installing the shipping brackets

  8. Hold the shipping brackets to remove the front GPU cold plate module from the chassis.
    1. Release the hoses from the hose ties that secure them to the hose guides.
    2. Secure the hoses to the shipping brackets with the hose ties on the shipping brackets.
    3. Hold the shipping brackets and lift the rear H100/H200 GPU cold plate module out of the chassis.
      Figure 9. Removing the rear H100/H200 GPU cold plate module
      Removing the rear H100/H200 GPU cold plate module
  9. Immediately clean the PCM and putty pads off from the GPUs with alcohol cleaning pads. Gently clean the PCM and putty pads to avoid GPU damages.
    Attention

    • It is recommended to clean the PCM while it is in liquid state.

    • The electrical components around the die on the GPUs are extremely delicate. When removing the PCM and cleaning the GPU die, avoid touching the electrical components to prevent damage.

    Figure 10. Cleaning PCM and putty pads off from the GPUs
    Cleaning PCM and putty pads off from the GPUs
  10. With alcohol cleaning pads, wipe off any remaining putty pad and PCMs from the GPU cold plate module.
    Figure 11. Wiping PCM and putty pads off from the cold plates
    Wiping PCM and putty pads off from the cold plates

After you finish

  1. Install a replacement unit. See Install the rear H100/H200 GPU cold plate module.
  2. 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.