For The 15-Inch Models - Lenovo IdeaPad 3 Series Hardware Maintenance Manual

Figure 58. Remove ten screws
Screw specifications
M2 x L2
M2 x L2.8
Step 2. Remove the two hinges.
Figure 59. Remove the two hinges
Go to
https://support.lenovo.com/partslookup
replacement parts:
Hinge
For the 15–inch models
Make sure the following FRUs (CRUs) have been removed.
68
IdeaPad 3/IdeaPad 3i/IdeaPad Slim 3/IdeaPad Slim 3i series Hardware Maintenance Manual
Number of screws
6
4
to look up the Lenovo part numbers of the following