HP ProBook 4545s, Maintenance And Service Manual

Page: 79 / 139

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 37 ).
5. Remove the following components:
a. Bottom door (see Bottom door on page 38 ).
b. Hard drive (see Hard drive on page 45 ).
c. Optical drive (see Optical drive on page 41 ).
d. WLAN/Bluetooth combo card (see WLAN/Bluetooth combo card on page 39 ).
e. Keyboard (see Keyboard on page 47 ).
f. Metal heat shield (see Metal heat shield on page 51 ).
g. Top cover (see Top cover on page 58 ).
When replacing the system board, be sure to remove the following components from the defective
system board and install on the replacement system board:
●
Memory module (see Memory modules on page 50 ).
●
WLAN card(see WLAN/Bluetooth combo card on page 39 ).
●
Fan (see Fan on page 53 ).
●
Heat sink (see Heat sink on page 54 ).
●
Processor (see Processor on page 56 ).
Remove the system board:
1. Position the computer upright with the front toward you.
2. Disconnect the main power cable (1) .
3. Disconnect the graphics cable (2) from the system board.
Component replacement procedures 71