Heat sink
NOTE: The system board spare part kit includes replacement thermal material.
Description Spare part number
For use only on computer models equipped with a graphics subsystem with discrete memory 746658-001
For use only on computer models equipped with a graphics subsystem with UMA memory 746659-001
Before removing the heat sink, follow these steps:
1. Turn off the computer. If you are unsure whether the computer is off 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 Battery (see Battery on page 29), and then remove the following components:
a. Service cover (see Service cover on page 30)
b. Hard drive (see Hard drive on page 31)
c. Optical drive (see Optical drive on page 37)
d. Keyboard (see Keyboard on page 38)
e. Top cover (see Top cover on page 41)
f. Speakers (see Speakers on page 49)
g. System board (see System board on page 52)
Remove the heat sink:
1. Turn the system board upside down with the front toward you.
2. Disconnect the fan cable (1) from the system board.
3. Following the 1 through 6 sequence stamped into the heat sink, loosen the six Phillips captive screws
(2) and (3) that secure the heat sink to the system board.
NOTE: The heat sink used on computer models equipped with a graphics subsystem with UMA
memory will only have the screws in location (2).
Component replacement procedures 57
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