Lenovo ThinkCentre A70 7099 Hardware Maintenance Manual page 153

9. Remove the six screws that secure the system board.
Figure 65. Removing the six screws that secure the system board
10. Lift the system board out of the chassis.
11. Remove the microprocessor from the failing system board and install it on the
new system board. See "Replacing the microprocessor" on page 135.
12. 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.
Then, install the six screws to secure the system board.
13. 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 131.
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 128 and "Installing or replacing a PCI card" on page 126.
15. Reconnect all remaining cables to the system board. See "Locating parts on the
system board" on page 120.
16. Lower the drive bay assembly. See "Accessing the system board components
and drives" on page 125.
17. Reinstall the front bezel. See "Removing and reinstalling the front bezel" on
page 123.
18. Reinstall the computer cover.
19. Go to "Completing the parts replacement" on page 157.
Chapter 9. Replacing FRUs - Desktop computers
147