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

Follow instructions in this section to remove the Lenovo Neptune^TM liquid-to-air (L2A) hybrid cooling module.

About this task

Important

Removing and installing this component requires trained technicians. Do not attempt to remove or install it without proper training.

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 server from the rack. See Remove the server from rack.

Prepare the following screwdrivers to ensure you can install and remove the corresponding screws properly.

Torque screwdriver type list	Screw Type
Phillips #1 head screwdriver	Phillips #1
Torx T10 head screwdriver	Torx T10 screw

Note

Make sure you have an alcohol cleaning pad available.

CAUTION

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

Procedure

1. Prepare your server.
   1. Remove the top cover. See Remove the top cover.
   2. Remove the 2.5-inch drive assembly. See Remove the 2.5-inch drive cage assembly.
   3. Remove the network adapters. See Remove a network adapter.
   4. Remove the front I/O expansion board module. See Remove the front I/O expansion board module.
2. Remove the retimer assembly. See Remove the retimer assembly.
3. Route the cold plate assembly pump cables through the cable clips on the cold plate assembly.
   Figure 1. Routing the pump cables through the cable clips
   
   
4. Disconnect the SXM GPU board power cable from the SXM GPU board and the SXM GPU power distribution board.
   Figure 2. Disconnecting the SXM GPU board power cable

   
   
   

   1 Cable guide

5. Remove the GPU-L2A assembly.
   1. Rotate up the clips and handle on the SXM GPU board.
   2. Hold the handles on both sides of the SXM GPU board, and lift the GPU-L2A assembly out of the chassis.
      Figure 3. Removing the GPU-L2A assembly

      
      
      

      1 SXM GPU board handle

6. With a PH 1 head screwdriver, unfasten the seven Philip #1 screws that secure the radiator to the GPU tray. Remove the screws with a torque screwdriver set to the proper torque. For reference, the torque required for the screws to fully tighten is 0.3±0.03 newton-meter, 2.7±0.27 pound-inch.
   Figure 4. Unfastening the screws on the radiator

   
   
   

   1 Radiator

   2 Cold plate assembly

7. With a Torx 10 screwdriver, unfasten the captive screws that secure the cold plates to the SXM GPU board in the removal sequence shown on the cold plate label. Remove the screws with a torque screwdriver set to the proper torque. For reference, the torque required for the screws to fully tighten is 0.4±0.06 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. Unfastening the screws on the cold plates
   
   
8. Hold the radiator by its upper edge and hold the cold plate assembly by its lifting handle; then, lift them up from the SXM GPU board.
   Note

   A flat tool may be needed to carefully disengage the cold plates from the GPUs. Make sure not to damage the GPUs while disengaging the cold plates.

   Figure 6. Disengaging the cold plates from the SXM GPU board
   
   

   Figure 7. Removing the L2A

   
   
   
9. Rotate the L2A counterclockwise.
   1. Hold the right end of the radiator which is attached with the tubes, and hold the cold plate assembly lifting handle.
   2. Rotate the L2A counterclockwise so that the left end of the radiator is standing on a flat surface, and the cold plate assembly lifting handle is facing your left side.
      Figure 8. Rotating the L2A counterclockwise
      
      
10. Turn the L2A upside down.
    1. Keep the left end of the radiator standing on the flat surface, and hold the cold plate assembly lifting handle.
    2. Move your hand to hold the bottom edge of the radiator, then turn the L2A upside down so that the upper side of the radiator and cold plate assembly lifting handle are facing down.
       Figure 9. Turning the L2A upside down
       
       
11. Place the L2A on a clean flat surface.
12. If there is any old thermal grease on the four GPUs, gently clean the top of the four GPUs with an alcohol cleaning pad.