Lenovo ThinkCentre Edge 91z Hardware Maintenance Manual page 125

5. Locate the system board in the computer. See "FRU locations" on page 86.
6. Remove the heat sink assembly. See "Replacing the heat sink assembly" on page 107.
7. Remove the microprocessor. See "Replacing the microprocessor" on page 108.
8. Remove the memory modules. See "Installing or replacing a memory module" on page 114.
9. Remove the battery. See "Replacing the battery" on page 113.
10. Remove the rear I/O assembly to gain access to the system board. See "Replacing the rear I/O
assembly" on page 100.
11. Note the locations of all cable connections on the system board and disconnect all cables. See "System
board parts and connectors" on page 88.
12. Remove the seven screws that secure the system board to the main bracket. Carefully lift the system
board out of the chassis.
Figure 41. Removing the seven screws that secure the system board to the main bracket
13. Place the new system board into the chassis and align the screw holes with those in the chassis.
14. Reinstall the seven screws that secure the system board to the main bracket.
15. Reinstall the rear I/O assembly. See "Replacing the rear I/O assembly" on page 100.
16. Reinstall the battery. See "Replacing the battery" on page 113.
17. Reinstall the memory modules. See "Installing or replacing a memory module" on page 114.
18. Reinstall the microprocessor. See "Replacing the microprocessor" on page 108.
19. Reinstall the heat sink assembly. See "Replacing the heat sink assembly" on page 107.
20. Reinstall the system board shield. See "Removing and reinstalling the system board shield" on page 102.
21. Reconnect all cables that were disconnected from the system board. See "System board parts and
connectors" on page 88.
22. Go to "Completing the parts replacement" on page 127.
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Chapter 8 Replacing FRUs
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