Lenovo V480 Hardware Maintenance Manual page 66

Removal steps of I/O board
1
Remove the screws , and then detach the cable.
Step Screw (quantity)
1
M2 × 6 mm, flat-head, nylon-coated (2)
When installing: Ensure that the cable is attached firmly to the system board.
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Hardware Maintenance Manual
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Color Torque
Black 3.0 kgf-cm