Lenovo IdeaPad 1 Series Hardware Maintenance Manual page 58

"Remove the hinge cover" on page 49
Step 1. Remove eight screws.
Figure 40. Remove eight screws
Screw specifications
M2.5 x L4.5
Step 2. Remove the hinges.
Figure 41. Remove the hinges
Go to
https://support.lenovo.com/partslookup
replacement part:
Hinge
52
IdeaPad Series 1 Hardware Maintenance Manual
Number of screws
8
to look up the Lenovo part numbers of the following