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Remove the Lenovo Neptune(TM) liquid-to-air (L2A) hybrid cooling module

Follow instructions in this section to remove the Lenovo NeptuneTM liquid-to-air (L2A) hybrid cooling module. The procedure must be executed by a trained technician.

About this task

Attention
CAUTION
Do not touch the radiator fins. Touching the radiator fins might damage the L2A.


Note
Make sure you have the required tools listed below available to properly replace the component:
  • Phillips #1 head screwdriver
  • Torx T15 head screwdriver
  • Alcohol cleaning pad
  • SXM5 PCM Kit
  • SR675 V3 water loop putty pad kit
  • SR675 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.

Procedure

  1. Make preparation for this task.
    1. Remove the top cover. See Remove the top cover.
    2. Remove all of the fans. See Remove a fan.
    3. Remove the fan cage. See Remove the fan cage.
    4. Unfasten the two cable ties on the front drive tray to release the cables.
      Figure 1. Unfastening the cable ties
      Unfastening the cable ties
    5. Depending on the configuration, remove the front PCIe adapter(s) or the OSFP port card. See Remove a front PCIe adapter or Remove the OSFP port card.
    6. Disconnect the following cables from the system board assembly:
      • Front I/O module cables
      • Front operator panel cable
    7. Depending on the configuration, remove all of the 2.5-inch hot-swap drives and the drive bay fillers (if any) or all of the E3.S hot-swap drives and the drive bay fillers (if any). See Remove a 2.5-inch hot-swap drive or Remove an E3.S hot-swap drive. Place the drives on a static protective surface.
    8. Depending on the configuration, disconnect the power and signal cables from the 2.5-inch drive backplane or the E3.S dive backplane.
    9. Depending on the configuration, remove the 2.5-inch drive cage or the E3.S drive cage assembly. See Remove the 2.5-inch drive cage or Remove the E3.S drive cage assembly.
    10. Depending on the configuration, remove the CX-7 assembly or the SXM5 PCIe switch board. See Remove the CX-7 assembly or Remove the SXM5 PCIe switch board.
    11. Remove the front drive tray. See Remove the front drive tray.
    12. Depending on the configuration, remove the front I/O expansion board carrier or the front I/O expansion board module. See Remove the front I/O expansion board carrier or Remove the front I/O expansion board module.
    13. Remove the interposer card. See Remove the interposer card.
  2. Hold the strap on the SXM5 GPU board assembly power cable, and disconnect it from the SXM5 GPU board assembly and the SXM5 GPU power distribution board.
    Figure 2. SXM5 GPU board assembly power cable disconnection

    SXM5 GPU board power cable disconnection
  3. Hold the radiator by its upper edge and hold the cold plate assembly by its lifting handle; then, lift the GPU-L2A assembly out of the chassis.
    Figure 3. GPU-L2A assembly removal
    GPU-L2A assembly removal
  4. Remove the six Phillips #1 screws (M3 x 5 mm) that secure the radiator to the GPU tray.
    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 0.3±0.03 newton-meter, 2.7±0.27 pound-inch
    Figure 4. Phillips #1 screw removal
    Phillips #1 screw removal
    1 Radiator2 Cold plate assembly
  5. Remove the sixteen Torx T15 screws that secure the cold plates to the SXM5 GPU board assembly in the removal sequence shown on the cold plate label.
    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.
    Attention
    To prevent damage to components, make sure to follow the indicated screw unfastening sequence shown on the cold plate label.
    Figure 5. Torx T15 screw removal
    Torx T15 screw removal
  6. With a flat tool, carefully disengage the four cold plates from the SXM5 GPUs.
    Attention
    Make sure not to damage the SXM5 GPUs while disengaging the cold plates.
    Figure 6. Cold plate disengagement
    Cold plate disengagement
  7. Hold the radiator by its upper edge and hold the cold plate assembly by its lifting handle; then, lift the L2A from the SXM5 GPU board assembly.
    Figure 7. L2A removal
    L2A removal
  8. Turn the L2A upside down.
    1. Hold the radiator by its upper edge and hold the cold plate assembly by its lifting handle; then, put the L2A into the shipping box.
    2. Place the top cover of the shipping box on top of the L2A and ensure it is firmly seated.
    3. Hold the shipping box and carefully turn it upside down.
    4. Remove the bottom cover of the shipping box.
    5. Remove the plastic tray and the bottom of the cold plate assembly is facing up.
      Figure 8. Turning the L2A upside down
      Turning the L2A upside down

      Turning the L2A upside down
  9. Wipe any remaining PCM and putty pads off from all the cold plates with alcohol cleaning pads.
    Figure 9. Wiping PCM and putty pads off from the cold plates
    Wiping PCM and putty pads off from the cold plates
  10. Gently wipe any remaining PCM and putty pads off from all the SXM5 GPUs with alcohol cleaning pads to avoid SXM5 GPU damages.
    Attention
    The electrical components around the die on the SXM5 GPUs are extremely delicate. When cleaning the SXM5 GPU die, avoid touching the electrical components to prevent damages.
    Figure 10. Wiping PCM and putty pads off from the SXM5 GPUs
    Wiping PCM and putty pads off from the SXM5 GPUs

After you finish

  1. To replace the SXM5 GPU board, see SXM5 GPU board assembly replacement (trained technician only).
  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.

Demo video

Watch the procedure on YouTube