Lenovo ThinkCentre M80 Hardware Maintenance Manual page 104

4. Lay the computer on its side for easier access to the system board.
5. Disconnect the front audio and USB assembly cables from the system board. See "Replacing the front
audio and USB assembly" on page 93.
6. Remove all memory modules and PCI cards that are currently installed. See "Installing or replacing a
memory module" on page 78 and "Installing or replacing a PCI card" on page 110.
7. Carefully take note of the location of all cable connections on the system board and disconnect all the
cables. See "Locating parts on the system board" on page 70.
8. Remove the heat sink and fan assembly from the failing system board. See "Replacing the heat sink and
fan assembly" on page 84.
9. Remove the battery from the system board. See "Replacing the battery" on page 80.
10. Remove the eight screws that secure the system board.
Figure 32. Removing the eight screws that secure the system board
11. Carefully slide the system board so that it can be released from the mounting studs that secure the
system board in place.
12. Lift the system board out of the chassis.
13. Remove the microprocessor from the failing system board and install it on the new system board.
See "Replacing the microprocessor" on page 86.
Note: If your new system board comes with a microprocessor socket cover, remove the socket cover
before you install the microprocessor on the new system board.
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ThinkCentre Hardware Maintenance Manual