Lenovo IdeaPad S540-15 Hardware Maintenance Manual page 59

Figure 43. Disconnect the remaining cables
Step 2. Remove the 6 screws.
Figure 44. Remove the 6 screws
Screw specifications
M2.0 x 3.0
Step 3. Remove the system board.
Figure 45. Remove the system board
Number of screws
6
.
Chapter 4 Removing a FRU or CRU
53