Lenovo IdeaPad Slim 7 Series Hardware Maintenance Manual page 48

Step 1. Disconnect any cables connected to the system board.
Figure 24. Disconnect cables
Step 2. Remove the nine screws and remove the system board.
Figure 25. Remove the system board
Screw specifications
M2 x L2.5
Go to https://support.lenovo.com/partslookup
replacement part:
System board
42
Hardware Maintenance Manual
Number of screws
9
to look up the Lenovo part numbers of the following