HP 550 Maintenance And Service Manual page 75

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
5. Remove the following components:
a. Hard drive (see
b. Optical drive (see
c. Keyboard (see
d. Switch cover (see
e. Speaker (see
f. Display lid switch module (see
g. Display assembly (see
h. Top cover (see
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
●
WLAN module (see
●
Processor (see Processor on page
● ExpressCard assembly (see
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.
Battery on page
Hard drive on page 40)
Optical drive on page
Keyboard on page 50)
Switch cover on page
Speaker on page 53)
Display lid switch module on page
Display assembly on page
Top cover on page 60)
Memory module on page
WLAN module on page
74)
ExpressCard assembly on page
39).
46)
48)
55)
45)
42)
79)
Component replacement procedures
54)
67