Remove the system board

Use this information to remove the system board.

About this task

S001

DANGER

danger

Electrical current from power, telephone, and communication cables is hazardous.

To avoid a shock hazard:

• Connect all power cords to a properly wired and grounded electrical outlet/source.
• Connect any equipment that will be attached to this product to properly wired outlets/sources.
• When possible, use one hand only to connect or disconnect signal cables.
• Never turn on any equipment when there is evidence of fire, water, or structural damage.
• The device might have more than one power cord, to remove all electrical current from the device, ensure that all power cords are disconnected from the power source.

Attention

• Read the following sections to ensure that you work safely.

  • Installation Guidelines

  • Safety inspection checklist

• Turn off the corresponding DWC tray that you are going to perform the task on.

  Note

  If Shared I/O adapters are installed, power off the auxiliary node (node 1/3/5/7/9/11) first, and then power off the primary node (node 2/4/6/8/10/12).
• Disconnect all external cables from the enclosure.

  Note

  Use extra forces 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.

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

Table 1. Screwdriver type list

Screwdriver type	Screw type
Torx T10 head screwdriver	Torx T10 screw
Torx T30 head screwdriver	Torx T30 screw
Phillips #1 head screwdriver or 3/16" hex head screwdriver	Phillips #1 screw
Phillips #2 head screwdriver	Phillips #2 screw
3/16" hex head screwdriver	Hex head screw
2.5x0.4 mm Flat head screwdriver	2.5x0.4 mm flat head screwdriver

Procedure

1. Make preparations for this task.
   1. Remove the tray (see Remove a DWC tray from the enclosure).
      Attention

      For safety, use the lift tool to remove the tray from the rack.

   2. Remove the tray cover (see Remove the tray cover).
   3. Remove the front and the rear cross braces (14x Phillips #1 screws).
      Figure 1. Cross brace removal
      
      
   4. Remove all DIMM combs (see Remove a DIMM comb).
   5. Remove DIMMs from both nodes (see Remove a memory module).
   6. Remove M.2 Backplanes from the node (see Remove the M.2 backplane).
   7. Remove drive cage assemblies from the node if applicable (see Remove a drive cage assembly).
   8. Remove PCIe riser assemblies from the node if applicable (see Remove a PCIe adapter).
   9. Remove two Torx T10 screw (per node); then, slide the VR clamp plate out of the node.
      Figure 2. VR clamp plate removal
      
      
   10. Remove water loop screws (13x Torx T10 screws per node) with a torque screwdriver sets to the proper torque.
       Note

       For reference, the torque required for the screws to be fully tightened/removed is 0.5-0.6 newton-meters, 4.5-5.5 inch-pounds.

       Figure 3. Water loop screws removal
       
       
   11. Remove the following screws to loosen the quick connect.

       • Four Torx T10 screws (per node) to loosen the quick connect.

       • Two Phillips #1 screws (per node) on the rear of the node.

       Figure 4. Screws removal
       
       
   12. Orient the water loop carrier with the M.2 backplane guide pin; then, gently put the water loop carrier down and ensure it is seated firmly on the water loop.
       Figure 5. Water loop carrier installation
       
       
   13. Tighten water loop carrier screws (12x Phillips #2 screws per node).
       Figure 6. Water loop carrier screws installation
       
       
   14. Loosen processors properly.

       1. ❶ Fully loosen all Torx T30 captive screws (8x Torx T30 captive screws per node) on cold plates in the removal sequence shown on the cold plate label (with a torque screwdriver sets to the proper torque).

          Note

          For reference, the torque required for the screws to be fully tightened/removed is 1.1-1.15 newton-meters, 9.8-10.2 inch-pounds.

          Attention

          To prevent damage to components, make sure that you follow the indicated loosening sequence.

       2. ❷ Rotate all anti-tilt wire bails (8x anti-tilt wire bails per node) inwards to the unlocked position.

       Figure 7. Loosening processors
       
       
   15. Fold the water loop.

       1. ❶ Carefully unhook the quick connect and slide it out of the opening in the rear of the tray; then, lift the water loop up off the system board.

       2. ❷ Carefully rotate the water loop so one half is sitting on top of the other half.

       Figure 8. Folding the water loop
       
       
   16. Remove the twoTorx T10 screws (per node) to remove the VR water loop trough out of the system board.
       Figure 9. VR water loop trough removal
       
       
   17. Remove the power distribution board (see Remove the power distribution board).
2. Remove the following screws.

   • Five Phillips #1 screws per node on the system board (with a torque screwdriver sets to the proper torque).

     Note

     For reference, the torque required for the screws to be fully tightened/removed is 0.5-0.6 newton-meters, 4.5-5.5 inch-pounds.
   • Two jackscrews per node at the front of the node.

     Note

     • Use 2.5x0.4 mm Flat head screwdriver to remove and install jackscrews.

     • For reference, the torque required for the screws to be fully tightened/removed is 0.059 newton-meters, 0.52 inch-pounds.

     Figure 10. 2.5x0.4 mm Flat head screwdriver
     
     
     Figure 11. Screws removal
     
     
3. Carefully hold the M.2 backplane guide pin and tilt the system board with an angle.
4. Gently slide the system board backward; then, carefully lift and remove the system board from the node.
   Note

   When you remove the system board from the node, avoid touching the connectors on the system board. Be careful not to damage any surrounding components inside the node.

   Figure 12. System board removal