Lenovo ThinkPad T540p Hardware Maintenance Manual page 97

Removal steps of the system board and base cover
When installing:
Ensure that the connector is attached firmly.
Step Screw (quantity)
3
M2 × 3 mm, flat-head, nylon-coated (2)
Color Torque
0.181 Nm
Silver
(1.85 kgf-cm)
.
Chapter 9 Removing or replacing a FRU
91