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

Follow instructions in this section to install the Lenovo Neptune^® 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.

CAUTION

When removing a new L2A from the shipping box, lift out the cold plate assembly with the plastic tray attached to prevent thermal grease on the cold plate assembly from damages. Only remove the masking tape from the plastic tray and cold plate assembly when you are about to install the L2A to the SXM GPU board.

CAUTION

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

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.

Procedure

1. Make sure the SXM GPU board is installed in the GPU tray.
   Attention

   If there is any old thermal grease on the four GPUs, gently clean the top of the four GPUs with an alcohol cleaning pad.
2. Hold the radiator by its upper edge and hold the cold plate assembly by its lifting handle to remove the L2A out of the shipping box.
   Attention

   To avoid damaging the thermal grease on the cold plate assembly, make sure the plastic tray is secured to the cold plate assembly with masking tapes when removing the L2A out of the shipping box.
3. Remove the masking tapes from the plastic tray and the cold plate assembly, and remove the protective cardboard packing from the radiator.
4. Hold the radiator by its upper edge and hold the cold plate assembly by its lifting handle to lift up the L2A.
5. Align the L2A with the upper left corner of the GPU tray and the screw holes on the SXM GPU board; then, gently place the L2A down onto the SXM GPU board.
   Figure 1. Placing the L2A onto the SXM GPU board
   
   
6. With a PH 1 head screwdriver, fasten the seven Philip #1 screws that secure the radiator to the GPU tray. Install 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 2. Fastening screws to the radiator
   
   

   1 Radiator

   2 Cold plate assembly

7. With a Torx 10 screwdriver, fasten the captive screws that secure the cold plates to the SXM GPU board in the installation sequence shown on the cold plate label. Install 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 fastening sequence shown on the cold plate label.

   Figure 3. Fastening screws on the cold plates
   
   
8. Remove the retimer assembly from the chassis. See Remove the retimer assembly
9. Install the GPU-L2A assembly.
   1. Pull the GPU-L2A assembly latch outward until it stops.
   2. Rotate up the clips and handle of the SXM GPU board, and hold the handles on both sides of the SXM GPU board.
   3. Align the GPU-L2A assembly with the six guide pins in the chassis, and gently place the GPU-L2A assembly into the chassis.
      Figure 4. Install the GPU-L2A assembly
      
      

      1 SXM GPU board handle

10. Route the SXM GPU board power cable through the cable clip and cable guide, and connect it to the SXM GPU board and the SXM GPU power distribution board in the rear of the chassis.
    Attention

    Make sure to route the cables through the cable clip and cable guide.

    Figure 5. Connecting SXM GPU board power cable
    
    
11. Rotate down the clips and handle of the SXM GPU board.
    Figure 6. Rotate down the clips and handle of the SXM GPU board