Lenovo ThinkPad T420si Hardware Maintenance Manual page 95

Removal steps of LCD unit
Step Screw Screw (quantity)
cap
1
M2.5 × 5 mm, flat-head, nylon-coated (2)
Color Torque
Black 0.392 Nm
(4.0 kgfcm)
.
Chapter 8 Removing and replacing a FRU
89