HP 550 HP 550 Notebook PC - Maintenance and Service Guide - Page 70

TouchPad board and TouchPad button board, Display assembly see

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TouchPad board and TouchPad button board NOTE: The top cover, spare part number 495399-001, includes the TouchPad board and cable, and the TouchPad button board and cable. Before removing the TouchPad board and TouchPad 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 38). 5. Remove the following components: a. Hard drive (see Hard drive on page 39) b. Optical drive (see Optical drive on page 45) c. Keyboard (see Keyboard on page 49) d. Switch cover (see Switch cover on page 46) e. Speaker (see Speaker on page 52) f. Display lid switch module (see Display lid switch module on page 53) g. Display assembly (see Display assembly on page 54) h. Top cover (see Top cover on page 59) Remove the TouchPad board and TouchPad button board: 1. Turn the top cover upside down, with the front toward you. 2. Release the ZIF connectors on the TouchPad button board (1) and TouchPad board (2) to which the TouchPad board cable is connected. 3. Disconnect and remove the TouchPad board cable (3). 62 Chapter 4 Removal and replacement procedures

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TouchPad board and TouchPad button board
NOTE:
The top cover, spare part number 495399-001, includes the TouchPad board and cable, and
the TouchPad button board and cable.
Before removing the TouchPad board and TouchPad 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
38
).
5.
Remove the following components:
a.
Hard drive (see
Hard drive
on page
39
)
b.
Optical drive (see
Optical drive
on page
45
)
c.
Keyboard (see
Keyboard
on page
49
)
d.
Switch cover (see
Switch cover
on page
46
)
e.
Speaker (see
Speaker
on page
52
)
f.
Display lid switch module (see
Display lid switch module
on page
53
)
g.
Display assembly (see
Display assembly
on page
54
)
h.
Top cover (see
Top cover
on page
59
)
Remove the TouchPad board and TouchPad button board:
1.
Turn the top cover upside down, with the front toward you.
2.
Release the ZIF connectors on the TouchPad button board
(1)
and TouchPad board
(2)
to which
the TouchPad board cable is connected.
3.
Disconnect and remove the TouchPad board cable
(3)
.
62
Chapter 4
Removal and replacement procedures