HP ProBook 4320s Maintenance And Service Manual page 111

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. SIM (see SIM on page
b. Switch cover (see
c. Keyboard (see
d. Speakers (see
e. WWAN module (see
f. Palm rest (see
g. Bluetooth module and cable (see
h. WLAN module (see
i. Hard drive (see
j. Optical drive (see
k. Display assembly (see
l. Top cover (see
m. Power connector and cable
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
●
WWAN module (see
●
Modem module (see
●
Processor (see Processor on page
Remove the system board:
1. Position the computer right-side up with the front toward you.
2. Remove the T8 slotted-Torx 2.5×5.0 screw (1) that secures the system board to the base
enclosure.
3. Disconnect the USB board cable from the system board (2).
Battery on page 56).
57)
Switch cover on page
Keyboard on page 60)
Speakers on page 67)
WWAN module on page
Palm rest on page 71)
Bluetooth module on page
WLAN module on page
Hard drive on page 73)
Optical drive on page
Display assembly on page
Top cover on page 98)
Memory module on page
WLAN module on page
WWAN module on page
Modem module on page
86)
58)
69)
80)
76)
64)
90)
62)
76)
69)
100)
Component replacement procedures 103