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## Remove the Motherboard Assembly

Note - This is a cold service procedure that must be performed by qualified service personnel. See Cold Service, Replaceable by Authorized Service Personnel for more information about this category of service procedures.

| Caution - The server must be fully shut down and the power cords disconnected.

| Caution - This procedure involves handling circuit boards that are extremely sensitive to static electricity. Ensure that you follow ESD preventative practices to avoid damaging the circuit boards.

| Caution - Components inside the chassis might be hot. Use caution when servicing components inside the chassis.

1. Stop the Oracle Solaris OS to get the OpenBoot PROM prompt.
2. Run the `printenv` command and make a note of any OpenBoot PROM variables that have been modified.
3. Power off the server.

   See Removing Power From the System.

4. Remove the server from the rack.

   See Remove the Server From the Rack.

5. Attach an antistatic wrist strap.
6. Remove the top cover.

   See Remove the Top Cover.

7. Swing the air duct up and forward to the fully open position.
8. Remove all PCIe/XAUI riser assemblies.

   See Remove a PCIe or PCIe/XAUI Riser.

   Note - Note which PCIe/XAUI slots the cards occupy.

   Note - If riser 0 contains a SAS PCIe RAID HBA card, disconnect the data cables from the card.

9. Disconnect the motherboard end of the two ribbon cables and move them out of the way of the motherboard removal.
10. Disconnect the motherboard end of the three backplane cables and move them out of the way of the motherboard removal.

    Note - If riser 0 contains a SAS PCIe RAID HBA card, there will only be the SATA DVD data cable connected to the motherboard.

    | Caution - The hard drive data cables are delicate. Ensure they are safely out of the way when servicing the motherboard.

11. If you are replacing the motherboard, remove the following components:
    - All DIMMs. Record the memory configuration so that you can recreate it on the new motherboard.
    - System configuration PROM.
    - Service processor.
12. Using a No. 2 Phillips screwdriver, remove the four screws that secure the motherboard assembly to the bus bar.

    | Caution - Use care when removing the bus bar screws to avoid touching a heat sink, which can be dangerously hot.

    Note - Set the four screws aside. You must use these screws to attach the motherboard to the bus bar during installation.

13. Loosen the captive screw securing the motherboard to the chassis.
14. Using the green handle, slide the motherboard toward the rear of the system approximately 1 cm (less than 1/2 inch).

    Tip - Note the metal tab projecting into the motherboard compartment from the rear, right corner of the chassis. In the next step, use care to avoid having this tab interfere with the removal of the motherboard.

15. Angle the motherboard up and lift out of the chassis (as shown in the figure).
16. Place the motherboard assembly on an antistatic mat.

##### Related Information

- Install the Motherboard Assembly

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