Lenovo ThinkPad W520 4284 Hardware Maintenance Manual page 104

Table 36. 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.
96
ThinkPad T520, T520i, and W520 Hardware Maintenance Manual
Torque
Color
Silver 0.392 Nm
(4.0 kgfcm)
Silver 0.181 Nm
(1.85 kgfcm)
0.181 Nm
Silver
(1.85 kgfcm)