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Heat sink assembly
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.
Description Spare part number
Heat sink assembly (includes replacement thermal material) 608629-001
Before removing the 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 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).
5. Remove the following components:
a. Service cover (see
Hard drive on page 33).
b. Hard drive (see
Hard drive on page 33).
c. Keyboard (see
Keyboard on page 43).
d. Top cover (see
Top cover on page 45).
e. System board (see
System board on page 55).
Remove the heat sink assembly:
To remove the heat sink assembly, follow these steps:
1. Following the 1, 2, 3, 4 sequence stamped into the heat sink assembly, loosen the 4 captive
screws (1) that secure the heat sink assembly to the system board.
NOTE: Due to the adhesive quality of the thermal material located between the heat sink
assembly and system board components, it may be necessary to move the heat sink assembly
from side to side to detach the assembly.
58 Chapter 4 Removal and replacement procedures ENWW