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Heat sink
Description Spare part number
Heat sink (includes replacement thermal material) 664999-001
NOTE: To properly ventilate the computer, allow at least 7.6 cm (3 in) of clearance on the left side 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 requirements.
Exhaust air is displaced through the ventilation grill located on the left side of the computer.
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 from the computer by first unplugging the power cord from the AC outlet
and then unplugging the AC adapter from the computer.
4. Remove the battery (see
Battery on page 32), and then remove the following components:
a. Service cover (see
WLAN module on page 37)
b. Keyboard (see
Keyboard on page 46)
c. Top cover (see
Top cover on page 53)
d. System board (see
System board on page 58)
Remove the heat sink:
1. Turn the system board upside down, with the front toward you.
2.
Loosen the captive screws (1) that secure the heat sink to the system board.
NOTE: The number of screws used to secure the heat sink to the system board varies by
computer model.
NOTE: Due to the adhesive quality of the thermal material located between the heat sink and
system board components, it may be necessary to move the heat sink from side to side to
detach it.
3. Remove the heat sink (2).
Component replacement procedures
63