Reverse this procedure to install the fan assembly.
NOTE To properly ventilate the computer, allow at least a 7.6-cm (3-inch) clearance on the left
and right sides of the computer.
The computer uses an electric fan for ventilation. The fan is controlled by a temperature sensor and is
designed to turn on automatically when high temperature conditions exist. These conditions are affected
by high external temperatures, system power consumption, power management/battery conservation
configurations, battery fast charging, and software applications. Exhaust air is displaced through the
ventilation grill located on the left side of the computer.
Heat sink
Description Spare part number
Heat sink (includes thermal paste) 438529-001
Before removing the heat sink, follow these steps:
1. Shut down 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 all external devices connected to the computer.
3. Disconnect the power cord.
4. Remove the battery (see
Battery on page 29).
5. Remove the following components:
a. Hard drive (see
Hard drive on page 30)
b. Memory/Mini PCI card module compartment cover (see
Memory module on page 32)
c. Optical drive (see
Optical drive on page 36)
d. Switch cover (see Switch cover on page 38)
e. Keyboard (see
Keyboard on page 40)
f. Display assembly (see
Display assembly on page 44)
g. Base enclosure (see
Base enclosure on page 49)
h. Fan assembly (see
Fan assembly on page 52)
Remove the heat sink:
1. Remove the four Phillips PM2.5×6.0 screws (1) that secure the heat sink to the system board.
2. Slide the heat sink (2) to the left until the right side of the heat sink clears the top cover.
NOTE Due to the adhesive quality of the thermal paste located between the heat sink and
processor, it may be necessary to move the heat sink from side to side to detach the heat
sink from the processor.
ENWW Component replacement procedures 53
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