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3. Remove the system board (2).
Reverse this procedure to install the system board.
Heat sink
Description Spare part number
Heat sink (includes replacement thermal material) 740146-001
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 keyboard/top cover (see
Keyboard/top cover on page 23), and then remove the
following components:
a. Speakers (see
Speakers on page 26)
b. Battery (see
Battery on page 28)
c. WLAN module (see
WLAN module on page 32)
54 Chapter 4 Removal and replacement procedures preliminary requirements