Lenovo ThinkBook 13s Gen 4 Hardware Maintenance Manual page 38

Figure 9. Peel off the pieces of tape
Step 3. Remove four screws and then open the hinge.
Figure 10. Open the hinge
Screw specifications
M2.5 x L5
M2 x L4
Step 4. Remove two screws and then remove the I/O bracket.
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Hardware Maintenance Manual
Number of screws
3
1