Lenovo ThinkCentre A85 Hardware Maintenance Manual page 144

10. Remove the eight screws that secure the system board.
Figure 75. Removing the eight screws that secure the system board
11. Lift the system board out of the chassis.
12. Remove the microprocessor from the failing system board and install it on the new system board. See
"Replacing the microprocessor" on page 119.
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.
13. Install the new system board into the chassis by aligning the eight mounting studs in the chassis with the
corresponding holes in the new system board. Then, install the eight screws to secure the system board.
14. Install the battery back to the system board. See "Replacing the battery" on page 115.
15. Install the heat sink and fan assembly and connect the heat sink and fan assembly cable to the new
system board. See "Replacing the heat sink and fan assembly" on page 116.
16. Install all memory modules and PCI cards removed from the failing system board on the new system
board. See "Installing or replacing a memory module" on page 113 and "Installing or replacing a PCI
card" on page 110.
17. Reconnect all remaining cables to the system board. See "Locating parts on the system board" on
page 104.
18. Lower the drive bay assembly. See "Accessing the system board components and drives" on page 109.
19. Reinstall the front bezel. See "Removing and reinstalling the front bezel" on page 108.
20. Reinstall the computer cover.
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ThinkCentre Hardware Maintenance Manual