Lenovo ThinkPad W520 Hardware Maintenance Manual - Page 108

Removal steps of system board and magnesium structure frame, When installing, Removal steps of MDC

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Removal steps of system board and magnesium structure frame 2 4 2 3 1 1 Step 1 2 3 Screw (quantity) Hex stud, nylon-coated (2) M2 × 7 mm, wafer-head, nylon-coated (2) M2 × 3 mm, wafer-head, nylon-coated (1) Color Silver Silver Silver Torque 0.392 Nm (4.0 kgfcm) 0.181 Nm (1.85 kgfcm) 0.181 Nm (1.85 kgfcm) 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. a b c d Removal steps of MDC Note: Only some selected models are installed with a MDC. 102 Hardware Maintenance Manual

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Removal steps of system board and magnesium structure frame
4
1
1
2
2
3
Step
Screw (quantity)
Color
Torque
1
Hex stud, nylon-coated (2)
Silver
0.392 Nm
(4.0 kgfcm)
2
M2 × 7 mm, wafer-head, nylon-coated (2)
Silver
0.181 Nm
(1.85 kgfcm)
3
M2 × 3 mm, wafer-head, nylon-coated (1)
Silver
0.181 Nm
(1.85 kgfcm)
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.
b
c
d
a
Removal steps of MDC
Note:
Only some selected models are installed with a MDC.
102
Hardware Maintenance Manual