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Fan/heat sink assembly
Description Spare part number
Fan/heat sink assembly (includes thermal paste and thermal pads) 431450-001
NOTE: To properly ventilate the computer, allow at least a 7.6-cm (3-inch) clearance on the right
side and rear panel 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.
Before removing the fan/heat sink assembly, 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 28).
5. Remove the following components:
a. Hard drive (see
Hard drive on page 29)
b. Memory module compartment cover (see
Memory module on page 31)
c. Optical drive (see
Optical drive on page 35)
d. Switch cover (see
Switch cover on page 37)
e. Keyboard (see
Keyboard on page 39)
f. Display assembly (see
Display assembly on page 43)
g. Top cover (see
Top cover on page 48)
h. System board (see
System board on page 54)
Remove the fan/heat assembly:
1. Turn the system board upside down, with the external monitor port toward you.
2. Disconnect the fan cable (1) from the system board.
3. Loosen the five Phillips PM2.5×5.0 screws (2) that secure the fan/heat sink assembly to the system
board.
Component replacement procedures 57