Heat sink
The heat sink is secured to the system board. You have to remove the system board and ip it over to remove
the heat sink.
To remove the heat sink:
1. Prepare the computer for disassembly (see Preparing to disassemble the computer on page 17).
2. Remove the bezel (see Bezel on page 23).
3. Remove the display panel (see Display panel on page 26).
4. Remove the system board (see System board on page 43), and then turn it over.
5. In the order indicated on the heat sink, loosen the nine captive Phillips screws 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 processors. This is especially important as the pins on the sockets are very
fragile and any damage to them may require replacing the system board.
6. Lift the heat sink out of the computer.
CAUTION: To reduce a degradation in thermal performance, be sure not to touch the thermal grease
on the surface of the processor or the heat sink.
To replace the heat sink, reverse the removal procedures.
Heat sink 49
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