HP ProBook 4430s, 4431s, 4330s and 4331s Notebook PCs - Maintenance and Service Guide

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 48).
5. Remove the following components:
a. Bottom door (see
Bottom door on page 50).
b. Hard drive (see
Hard drive on page 53)
c. Optical drive (see
Optical drive on page 51)
d. Modem module (see
Modem module on page 81)
e. Fan (see
Fan on page 67)
f. Heat sink (see
Heat sink on page 69)
g. Keyboard (see
Keyboard on page 64)
h. Top cover (see
Top cover on page 72)
When replacing the system board, be sure to remove the following components from the defective
system board and install on the replacement system board:
●
SIM (see
SIM on page 49)
●
Memory module (see
Memory modules on page 55)
●
WLAN module (see
WLAN/Bluetooth combo card on page 59)
●
WWAN module (see
WWAN module on page 57)
●
Modem module (see
Modem module on page 81)
●
Processor (see
Processor on page 71)
Remove the system board:
1. Position the computer upright with the front toward you.
94 Chapter 4 Removal and replacement procedures