Lenovo 10A4 Hardware Maintenance Manual page 278

Figure 286. Removing the system board
11. Remove the microprocessor from the failing system board and install it on the new system board. See
"Replacing the microprocessor" on page 266.
12. Install the new system board into the chassis by aligning the five screw holes in the new system board
with the corresponding mounting studs on the chassis. Then, install the five screws to secure the system
board by installing screw
Figure 287. Installing the five screws to secure the system board
13. Reinstall the thermal module. See "Replacing the thermal module" on page 264.
14. Reinstall the system fan. See "Replacing the system fan" on page 263.
15. Reinstall the Wi-Fi card module if you have removed it. See "Replacing the Wi-Fi card module" on page
254.
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ThinkCentre M83 and M93/p Hardware Maintenance Manual
5 to screw 1 as shown in the following illustration.