Lenovo M490s Hardware Maintenance Manual page 64

Removal steps of the power board
1
Remove the screws .
Step Screw (quantity)
1
M2.5 × 5 mm, flat-head, nylon-coated (3)
In step 2 , open the LCD hinge by pivoting it upward. Then detach the connector.
When installing: Ensure that the connector is attached firmly to the system board.
Remove the power board.
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Hardware Maintenance Manual
Torque
Color
Black 0.392 Nm
(4.0 kgf-cm)