HP ProBook 4545s Notebook PC Maintenance and Service Guide

8. Lift the system board (2) up on its right end and remove it from the computer .
Reverse this procedure to install the system board.
RTC battery
Description Spare part number
RTC battery 683601-001
Before removing the RTC battery, 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. Metal heat shield (see
Metal heat shield on page 51).
e. Fan (see
Fan on page 53).
f. Heat sink (see
Heat sink on page 54).
g. Keyboard (see
Keyboard on page 47).
Component replacement procedures 73