Lenovo ThinkPad Edge E431 Hardware Maintenance Manual page 108

Removal steps of the LCD non-touch panel
Step Screw (quantity)
1
M2 × 2.5 mm, wafer-head, nylon-coated, small head (4)
When installing: Ensure that the LCD connector is attached firmly.
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Hardware Maintenance Manual
1
1
1
1
Color Torque
Black 0.181 Nm
(1.85 kgf-cm)