Lenovo ThinkPad T490s Hardware Maintenance Manual page 100

Step Screw (quantity)
17
M2 × 3 mm, flat head, nylon-coated (4)
18
M2 × 2.2 mm, flat head, nylon-coated (2)
When installing: Ensure that the connectors are attached firmly.
Attention: The Central Processing Unit (CPU)
sensitive. When you service the system board, avoid any kind of rough handling.
94
T490s and X390 Hardware Maintenance Manual
a soldered on the top side of the system board is extremely
Color Torque
Silver 0.181 Nm
(1.85 kgf-cm)
Black 0.181 Nm
(1.85 kgf-cm)