Lenovo ThinkCentre 6136 Hardware Maintenance Manual page 98

To replace the heat sink:
1. Open the computer cover. See "Opening the computer cover" on page 84.
2. Locate the heat sink. See "Locating components" on page 82.
3. Remove the four screws that secure the heat sink to the system board.
Figure 14. Removing the heat sink
4. Lift the failing heat sink off the system board.
5. Position the new heat sink on the system board so that the four screws are
6. Alternate tightening each screw a small and equal amount until the heat sink is
7. Go to "Completing the FRU replacement" on page 106.
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Hardware Maintenance Manual
Note: Carefully remove the four screws from the system board to avoid any
possible damage. The four screws cannot be removed from the heat sink.
Notes:
a. You might have to gently twist the heat sink to free it from the
microprocessor.
b. Do not touch the thermal grease while handling the heat sink.
aligned with the holes on the system board.
secured to the system board. Do not over-tighten the screws.