Lenovo 40221GU Hardware Maintenance Manual page 70

7. Pull the system board away from the chassis and disconnect all the
cables away from the underside of the system board.
8. Place the system board upside down on a flat surface.
9. Remove the CPU heat sink. Refer to the steps 3 to 8 of the "Replacing
the CPU heat sink" section.
10. Remove the memory module. Refer to the step 6 of the "Replacing a
memory module" section.
11. Install the memory module on the new system board. Refer to the step
7 of the "Replacing a memory module" section.
12. Install the CPU heat sink on the new system board. Refer to the steps 9
to 10 of the "Replacing the CPU heat sink" section.
13. Connect related cables to the underside of the system board. Place the
new system board upside down.
14. Place the new system board into the chassis, aligning the screw holes
on the system board with the mounting holes on the chassis.
15. Screw back the eight screws on the new system board.
16. Install the TV tuner card on the upside of the new system board. Refer
to the step 6 to 8 of the "Replacing the TV tuner card" section.
17. Install the wireless card on the upside of the new system board. Refer
to the step 6 to 8 of the "Replacing the wireless card" section.
18. Connect related cables to the upside of the system board.
19. Install the LCD panel. Refer to steps 5 to 6 of the "Replacing the LCD
panel" section.
20. Install the computer cover. Refer to "Completing the installation" .
Chapter 7. Replacing hardware
67