Lenovo IdeaPad S540-15 Hardware Maintenance Manual page 55

Figure 36. Disconnect the LCD cable
Step 3. Remove the 6 screws that secure the hinges to the upper case.
Figure 37. Remove the 6 screws
Screw specifications
M2.5 x 4.0
Step 4. Open the hinges.
Number of screws
6
.
Chapter 4 Removing a FRU or CRU
49