HP ProBook 440 G1 Notebook PC Maintenance and Service Guide

4. Remove the fingerprint reader board and cable assembly from the top cover (3), and then lift the
holder from the top cover (4).
Reverse this procedure to install the fingerprint reader assembly.
Power button board
Description Spare part number
Power button board assembly 721531-001
Before removing the 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 37).
5. Remove the following components:
a. Service door (see
Service door on page 38)
b. Keyboard (see
Keyboard on page 50)
c. Optical drive (
Optical drive on page 42)
d. Top cover (see
Top cover on page 54)
e. Speakers (see
Speaker assembly on page 59).
62 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts