3. 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 for hybrid graphics memory.
Heat sink for CPU and graphics
Description Spare part number
Heat sink for CPU and graphics 725625-001
Before removing the heat sink for CPU and graphics, 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 battery (see Battery on page 34).
Remove the heat sink for CPU and graphics:
1. Remove the 2 Phillips screws (1), and then remove the heat sink (2) from the system board.
50 Chapter 5 Removal and replacement procedures for authorized service provider parts
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