5. Lift the right side of the system board, and remove it from the base enclosure (3).
Reverse this procedure to install the system board.
Fan/heat sink assembly
The heat sink spare part kit includes replacement thermal material.
Description Spare part number
Fan/heat sink assembly 649759-001
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 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 following components:
a. Remove the battery (see
Battery on page 41)
b. Remove the service access cover (see
Service access cover on page 42)
c. Remove the SIM card (see
SIM on page 45)
d. Remove the memory module (see
Primary memory module on page 43)
e. Remove the hard drive (see
Hard drive on page 46)
f. Remove the WLAN module (see
WLAN module on page 48)
g. Remove the WWAN module (see
WWAN module on page 51)
78 Chapter 4 Removal and replacement procedures
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