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Heat sink
NOTE: The fan and heat sink are combined into one assembly. All fan/heat sink spare part kits
contain replacement thermal material.
Description Spare part number
Heat sink 727766-001
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 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 35).
5. Remove the following components:
a. Service door (see
Service door on page 43).
b. Hard drive (see
Hard drive on page 40)
c. Keyboard (see
Keyboard on page 37)
d. Top cover (see
Top cover on page 50)
e. System board (see
System board on page 71)
Remove the heat sink:
1. Position the system board upside-down with the front toward you.
2. In the order indicated, loosen the 4 captive Phillips screws (1)-(4) that secure the heat sink to the
system board.
3. Disconnect the fan cable (5) from the system board.
74 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts