Lenovo ThinkPad T431s Maintenance Manual page 80

Removal steps of the system board
When installing:
Ensure that the connectors are attached firmly.
Step Screw (quantity)
11
M2 × 3 mm, big head, nylon-coated (2)
12
M2 × 2.5 mm, flat-head, nylon-coated (1)
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Hardware Maintenance Manual
1
2
3
10
11
9
11
11
12
4
5
6
Color Torque
Silver 0.181 Nm
(1.85 kgf-cm)
Black 0.181 Nm
(1.85 kgf-cm)