Lenovo 20MU Hardware Maintenance Manual page 88

Removal steps of the system board
Step Screw (quantity)
1
M2 × 3.5 mm, flat head, nylon-coated (3)
3
M2 × 4 mm, flat head, nylon-coated (3)
82
A485 Hardware Maintenance Manual
Color Torque
Silver 0.181 Nm
(1.85 kgf-cm)
Black 0.181 Nm
(1.85 kgf-cm)