Lenovo ThinkCentre Hardware Maintenance Manual page 124

Figure 49. Reinstalling the system board
18. Reinstall the heat sink and fan assembly for GPU if your computer has one. See "Replacing the heat
sink and fan assembly for GPU" on page 108.
19. Reinstall the card reader if your computer has one. See "Replacing the card reader" on page 106.
20. Reinstall the ExpressCard if your computer has one. See "Replacing the ExpressCard" on page 107.
21. Reinstall the WiFi card if your computer has one. See "Replacing the WiFi card" on page 102.
22. Reinstall the battery. See "Replacing the battery" on page 111.
23. Reinstall the memory modules. See "Installing or replacing a memory module" on page 86.
24. Reinstall the microprocessor. See "Replacing the microprocessor" on page 94.
25. Reinstall the heat sink. See "Replacing the heat sink" on page 93.
26. Reinstall the rear I/O assembly. See "Removing and reinstalling the rear I/O assembly" on page 85.
27. Reconnect all cables that were disconnected from the system board. See "Locating parts on the
system board" on page 79.
28. Go to "Completing the parts replacement" on page 126.
The failing system board must be returned with a microprocessor socket cover to protect the pins during
shipping and handling.
To install the microprocessor socket cover, do the following:
1. Release the lever securing the microprocessor retainer and open the retainer to access the
microprocessor.
2. Grasp the microprocessor on the sides and lift it straight up and out of the socket. Do not touch the
contacts on the microprocessor socket.
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ThinkCentre Hardware Maintenance Manual