HP Dv4 1540us Service Guide - Page 118

Power button board

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Power button board Description Power button with connector cable Spare part number 486853-001 Before removing the power 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 55). 5. Remove the following components: a. Hard drive (see Hard drive on page 59) b. Optical drive (see Optical drive on page 57) c. Keyboard (see Keyboard on page 72) d. Keyboard cover (see Keyboard cover on page 74) e. Display assembly (see Display assembly on page 80) f. Top cover (see Top cover on page 92) g. System board (see System board on page 107) Remove the power button board: 1. Disconnect the low insertion force (LIF) cable (1) from the power button board. 2. Remove the Phillips PM2.0×4.0 screw (2) that secures the power button board to the system board. 110 Chapter 4 Removal and replacement procedures

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Power button board
Description
Spare part number
Power button with connector cable
486853-001
Before removing the power 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
55
).
5.
Remove the following components:
a.
Hard drive (see
Hard drive
on page
59
)
b.
Optical drive (see
Optical drive
on page
57
)
c.
Keyboard (see
Keyboard
on page
72
)
d.
Keyboard cover (see
Keyboard cover
on page
74
)
e.
Display assembly (see
Display assembly
on page
80
)
f.
Top cover (see
Top cover
on page
92
)
g.
System board (see
System board
on page
107
)
Remove the power button board:
1.
Disconnect the low insertion force (LIF) cable
(1)
from the power button board.
2.
Remove the Phillips PM2.0×4.0 screw
(2)
that secures the power button board to the system board.
110
Chapter 4
Removal and replacement procedures