2. The following illustration shows the replacement thermal material locations. The thermal material must
be thoroughly cleaned from the surfaces of the heat sink and the system board components each time
the heat sink is removed. Replacement thermal material is included with the heat sink and system board
spare part kits.
Thermal paste is used on the system board components (1), (3) and on the heat sink areas (2), (4) that
service them.
Reverse this procedure to install the heat sink.
PCH heat sink
Heat sink
PCH heat sink 725625-001
Before removing the platform controller hub (PCH) heat sink, follow these steps:
1. Turn o the computer. If you are unsure whether the computer is o or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Disconnect the power from the computer by unplugging the power cord from the computer.
3. Disconnect all external devices from the computer.
4. Remove the base enclosure (see Base enclosure on page 32).
5. Disconnect the cable from the battery.
Remove the PCH heat sink:
1. Remove the 2 Phillips screws (1), and then remove the heat sink from the system board (2).
Component replacement procedures 45
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