Lenovo ThinkPad S431 Hardware Maintenance Manual page 89

Removal steps of audio, HDMI, and USB sub card
1. Remove the screws.
Step Screw (quantity)
1
M2.5 × 4 mm, wafer-head, nylon-coated (2)
2
M2 × 4 mm, wafer-head, nylon-coated (1)
2. Open the keyboard bezel several inches 3 .
Chapter 9
Color Torque
Black 0.196 Nm
(2.00 kgf-cm)
Black 0.196 Nm
(2.00 kgf-cm)
.
Removing or replacing a FRU
83