Lenovo ThinkPad X220 Tablet Hardware Maintenance Manual page 108

Removal steps of LCD rear cover and wireless antenna cables
Step Screw (quantity)
1
M2 × 3.5 mm, wafer-head, nylon-coated (1)
In step 3 , release the antenna cables from the cable guides of the rear cover.
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Hardware Maintenance Manual
Color Torque
Silver 0.181 Nm
(1.85 kgfcm)