Lenovo ThinkCentre M72e Hardware Maintenance Manual page 110

Figure 50. Removing the system board
12. Remove the microprocessor from the failing system board and install it on the new system board. See
"Replacing the microprocessor" on page 102.
13. Position the new system board into the chassis so that the screw holes in the new system board are
aligned with those in the chassis. Install the five screws that secure the system board to the chassis by
installing screw 5 to screw 1 .
14. Install the heat sink on the new system board. See "Replacing the heat sink" on page 99.
15. Install the hard disk drive bracket. See "Replacing the hard disk drive bracket" on page 107.
16. Install the system fan. See "Replacing the system fan" on page 117.
17. Install all memory modules removed from the failing system board on the new system board. See
"Installing or replacing a memory module" on page 79.
18. Reconnect all remaining cables to the system board. See "Locating parts on the system board"
on page 72.
19. To complete the replacement, go to "Completing the parts replacement" on page 123.
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.
3. Lower the microprocessor retainer, and then lower the lever to secure the retainer. Make sure the
lever is locked into position.
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ThinkCentre Hardware Maintenance Manual