Reverse this procedure to install the USB board.
Power button board
Description Spare part number
Power button board 858974-001
Power button board cable 858966-001
IMPORTANT: Make special note of each screw and screw lock size and location during removal
and replacement.
Before removing the power button board, follow these steps:
1. Shut down the computer.
2. Disconnect all external devices connected to the computer.
3. 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.
4. Remove the base enclosure (see Base enclosure on page 32).
5. Disconnect the battery (see Battery on page 34), and then remove the following components:
a. Display assembly (see Display assembly on page 37).
b. Hard drive (see Hard drive on page 39).
c. USB board (see USB board on page 45).
Remove the power button board:
1. Remove the Phillips screw (1) securing the power button board.
46 Chapter 5 Removal and replacement procedures for authorized service provider parts
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