Lenovo ThinkPad T490 Hardware Maintenance Manual page 92

Step Screw (quantity)
11
M2 × 3 mm, flat-head, nylon-coated (3)
When installing: Ensure that the connectors are attached firmly.
Attention: The following components soldered on the top side of the system board are extremely sensitive.
When you service the system board, avoid any kind of rough handling.
For models with a discrete graphics card
a Graphics Processing Unit (GPU)
b Central Processing Unit (CPU)
For models with an integrated graphics card
a Central Processing Unit (CPU)
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T490 Hardware Maintenance Manual
Color Torque
Silver 0.181 Nm
(1.85 kgf-cm)