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Power button board
Description Spare part number
Power button board (includes power button board cable) 431438-001
Before removing the 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 41).
5.
Remove the switch cover (see
Switch cover on page 52).
6.
Remove the keyboard (see
Keyboard on page 54).
Remove the power button board:
1. Remove the Phillips PM2.5×4.0 screw (1) that secures the power button board to the fan/heat sink
assembly.
2. Release the power button board (2) from the computer as far as the cables allow.
3. Disconnect the microphone cable (1) and the speaker cable (2) from the power button board.
4. Release the ZIF connector (3) to which the power button board cable is connected, and disconnect
the cable.
56 Chapter 4 Removal and replacement procedures