Lenovo IdeaPad 3 Series Hardware Maintenance Manual page 69

Figure 51. Remove five screws and open the right hinge
Screw specifications
M2 x L2.8
M2.5 x L5
Step 3. Remove the system board.
Figure 52. Remove the system board
Go to
https://support.lenovo.com/partslookup
replacement part:
System board
Number of screws
3
2
to look up the Lenovo part numbers of the following
.
Chapter 4 Removing a FRU or CRU
63