Power button board
Description Spare part number
Power button board L28251-001
Power button board cable (included in Cable Kit) L28263-001
Before removing the power button board, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is o or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Place the computer in “Battery Safe mode” (Battery Safe mode on page 31).
3. Disconnect all external devices connected to the computer.
4. Disconnect the power from the computer by rst unplugging the power cord from the AC outlet, and
then unplugging the AC adapter from the computer.
5. Remove the following components:
a. Service door (Service doors on page 32)
b. Keyboard (Keyboard on page 40)
c. Top cover (Top cover on page 47)
d. Battery (Battery on page 52)
e. Display assembly Display assembly on page 62)
Remove the power button board:
1. Disconnect the cable from the ZIF connector on the power button board (1).
2. Remove the Phillips M2.0×4.0 screw (2) that secures the board to the computer.
Component replacement procedures 77
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