Reverse this procedure to install the power button board.
ExpressCard assembly
Description Spare part number
ExpressCard assembly (includes activity LEDs and Thunderbolt port, Dual Mode DisplayPort, and USB
port)
794579-001
Before removing the ExpressCard assembly, 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 battery (see
Battery on page 44), and then remove the following components:
a. Service cover (see
Service cover on page 45)
b. Hard drive (see
Hard drive on page 46)
c. Optical drive (see
Optical drive on page 48)
d. Keyboard (see
Keyboard on page 57)
e. Top cover (see
Top cover on page 65)
Remove the ExpressCard assembly:
1. Remove the Torx T8M2.5×4.5 screw (1) that secures the system lens to the base enclosure.
2. Remove the system lens (2).
The system lens is available in the Plastics Kit, spare part number 734297-001.
3. Remove the three Torx T8M2.5×4.5 screws (3) that secure the ExpressCard assembly to the
base enclosure.
74 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts
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