Lenovo ThinkCentre A70 7099 Hardware Maintenance Manual page 119

9. Remove the six screws that secure the system board.
Figure 30. Removing the six screws that secure the system board
10. Carefully slide the system board so that it can be released from the mounting
studs that secure the system board in place.
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 102.
13. Install the new system board into the chassis by aligning the six mounting
studs in the chassis with the corresponding holes in the new system board.
Carefully slide the new system board into the chassis until it is secured in
place by the mounting studs. Then, install the six screws to secure the system
board.
14. 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 94 and "Installing or replacing a PCI card" on page 91.
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 100.
16. Reconnect all remaining cables to the system board. See "Locating parts on the
system board" on page 86.
17. Reinstall the front bezel. See "Removing and reinstalling the front bezel" on
page 90.
18. Reinstall the computer cover.
19. Go to "Completing the parts replacement" on page 114.
Chapter 8. Replacing FRUs - Tower computers
113