HP 550 HP 550 Notebook PC - Maintenance and Service Guide - Page 55

Turn the computer right-side up, with the front toward you.

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Before removing the switch cover, 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 38). Remove the switch cover: 1. Turn the computer upside down, with the rear panel toward you. 2. Remove the two slotted Torx T8M2.5×9.0 screws (1) and the three Torx T8M2.5×3.0 broad-head screws (2) that secure the switch cover to the computer. 3. Turn the computer right-side up, with the front toward you. 4. Open the computer as far as possible. 5. Release the ZIF connector to which the button board cable (1) is attached, and disconnect the cable from the system board. Component replacement procedures 47

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Before removing the switch cover, 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
38
).
Remove the switch cover:
1.
Turn the computer upside down, with the rear panel toward you.
2.
Remove the two slotted Torx T8M2.5×9.0 screws
(1)
and the three Torx T8M2.5×3.0 broad-head
screws
(2)
that secure the switch cover to the computer.
3.
Turn the computer right-side up, with the front toward you.
4.
Open the computer as far as possible.
5.
Release the ZIF connector to which the button board cable
(1)
is attached, and disconnect the
cable from the system board.
Component replacement procedures
47