Lenovo ThinkPad T520 Hardware Maintenance Manual page 108

Removal steps of system board and magnesium structure frame
Step Screw (quantity)
1
Hex stud, nylon-coated (2)
2
M2 × 7 mm, wafer-head, nylon-coated (2)
3
M2 × 3 mm, wafer-head, nylon-coated (1)
When installing When you replace the system board, attach thermal rubbers as shown in this figure.
Depending on the models you are servicing, the number of thermal rubbers are different. Check the thermal
rubbers on the old system board, and find duplicates of them in the new FRU package and apply them to
the new system board.
Removal steps of MDC
Note: Only some selected models are installed with a MDC.
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Hardware Maintenance Manual
Color Torque
Silver 0.392 Nm
(4.0 kgfcm)
Silver 0.181 Nm
(1.85 kgfcm)
Silver 0.181 Nm
(1.85 kgfcm)