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6. Remove the system board (3) by sliding it up and to the right at an angle.
Reverse this procedure to install the system board.
Heat sink
NOTE: The heat sink spare part kit includes replacement thermal material.
Description Spare part number
For use only on computer models equipped with a graphics subsystem with discrete memory 686021-001
For use only on computer models equipped with a graphics subsystem with UMA memory 693371-001
Before removing the heat sink, follow these steps:
1. Turn off 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 the power from the computer by unplugging the power cord from the computer.
3. Disconnect all external devices from the computer.
4. Remove the battery (see
Battery on page 67), and then remove the following components:
a. Service cover (see
Service cover on page 69)
b. Hard drive (see
Hard drive on page 75)
c. Optical drive (see
Hard drive on page 75)
d. WLAN module (see
WLAN module on page 81)
e. WWAN module (see
WWAN module on page 79)
f. Fan (see
Fan on page 85)
110 Chapter 4 Removal and replacement procedures