HP ProBook 450 G3 Notebook PC - Maintenance and Service Guide

4. Remove the 11 Torx T8M2.5×6.0 screws that secure the top cover to the computer.
5. Position the computer upright and open it as far as possible.
6. Disconnect the following cables from the system board:
(1): Power button board cable
(2): Card reader board cable
(3): Fingerprint reader cable
(4): Function board cable
Component replacement procedures 55