HP KS159UT HP 550 Notebook PC - Maintenance and Service Guide - Page 75

WLAN module see, Processor see

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Before removing the system 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 39). 5. Remove the following components: a. Hard drive (see Hard drive on page 40) b. Optical drive (see Optical drive on page 46) c. Keyboard (see Keyboard on page 50) d. Switch cover (see Switch cover on page 48) e. Speaker (see Speaker on page 53) f. Display lid switch module (see Display lid switch module on page 54) g. Display assembly (see Display assembly on page 55) h. Top cover (see Top cover on page 60) When replacing the system board, be sure that the following components are removed from the defective system board and installed on the replacement system board: ● Memory module (see Memory module on page 45) ● WLAN module (see WLAN module on page 42) ● Processor (see Processor on page 74) ● ExpressCard assembly (see ExpressCard assembly on page 79) Remove the system board: 1. Remove the RJ-11 jack (1) from the clip built into the base enclosure and remove the RJ-11 jack cable from the hook (2) built into the base enclosure. Component replacement procedures 67

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Before removing the system 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
39
).
5.
Remove the following components:
a.
Hard drive (see
Hard drive
on page
40
)
b.
Optical drive (see
Optical drive
on page
46
)
c.
Keyboard (see
Keyboard
on page
50
)
d.
Switch cover (see
Switch cover
on page
48
)
e.
Speaker (see
Speaker
on page
53
)
f.
Display lid switch module (see
Display lid switch module
on page
54
)
g.
Display assembly (see
Display assembly
on page
55
)
h.
Top cover (see
Top cover
on page
60
)
When replacing the system board, be sure that the following components are removed from the defective
system board and installed on the replacement system board:
●
Memory module (see
Memory module
on page
45
)
●
WLAN module (see
WLAN module
on page
42
)
●
Processor (see
Processor
on page
74
)
●
ExpressCard assembly (see
ExpressCard assembly
on page
79
)
Remove the system board:
1.
Remove the RJ-11 jack
(1)
from the clip built into the base enclosure and remove the RJ-11 jack
cable from the hook
(2)
built into the base enclosure.
Component replacement procedures
67