HP ProBook 4740s Notebook PC Maintenance and Service Guide

Function board/Power button board assembly
Description Spare part number
Function board/Power button board assembly (includes cable) 684613-001
Before removing the function board and power button 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 40).
5. Remove the following components:
a. Bottom door (see
Bottom door on page 41).
b. Keyboard (see
Keyboard on page 52)
c. Top cover (see
Top cover on page 54)
Remove the function board/power button board assembly:
1. Position the top cover upside-down with the front toward you.
2. Remove the two Phillips PM2.0×3.0 screws (1) that secure the function (quick) board to the top
cover and the two Phillips PM2.0×3.0 screws (1) that secure the power button board to the top
cover.
3. Lift the function board from the top cover (2).
Component replacement procedures 61