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Function board/Power button board
Description Spare part number
Function board/Power button board (includes cable) 684240-001
Before removing the function board and power button board, 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 31).
5. Remove the following components:
a. Bottom door (see
Bottom door on page 33).
b. Keyboard (see
Keyboard on page 45)
c. Top cover (see
Top cover on page 47)
Remove the function board/power button board assembly:
1. Position the top cover upside-down.
2. Remove the three Phillips PM2.0×3.0 screws (1) that secure the boards to the top cover.
NOTE: The function board is secured with two screws. The power button board is secured with
one screw.
3. Remove the function board from the top cover (2).
56 Chapter 4 Removal and replacement procedures