Heat sink
CAUTION: The bond between the heat sink and the processor may be very tight.
If the computer will power on, before removing the heat sink, turn on the computer until it warms the
heat sink. Warming the heat sink lessens the bond between the heat sink and the processor, thereby
making separating them easier.
Make sure not to pull the processor out of the socket when you lift the heat sink, especially if you
cannot warm the heat sink prior to removal. Inadvertently removing the processor can damage the
pins.
1. Prepare the computer for disassembly (Preparation for disassembly on page 32).
2. Remove the access panel (
Access panel on page 33).
3. Disconnect the fan cable from the system board connector labeled CPUFAN (1).
4. Loosen the four silver captive Torx T15 screws (2) that secure the heat sink to the system board.
CAUTION: Remove heat sink retaining screws in diagonally opposite pairs (as in an X) to even
the downward forces on the processor. The pins on the socket are very fragile and any damage
to them may require replacing the system board.
5. Lift the heat sink from atop the processor (3).
When reinstalling the heat sink, make sure that its bottom has been cleaned with an alcohol wipe and
fresh thermal grease has been applied to the top of the processor.
CAUTION: Heat sink retaining screws should be tightened in diagonally opposite pairs (as in an X)
to evenly seat the heat sink on the processor. This is especially important as the pins on the socket
are very fragile and any damage to them may require replacing the system board.
Heat sink 55
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