HP ProBook 450 G4 Notebook PC and HP ProBook 455 G4 Notebook PC - Maintenance and Service Guide

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Memory modules (see Memory modules on page 38)
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WLAN/Bluetooth module (see WLAN/Bluetooth combo card on page 40)
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WWAN module (see WWAN module on page 42)
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M.2 solid-state drive (see M.2 solid-state drive on page 44)
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Heat sink (see Heat sink assembly on page 79)
Remove the system board:
1. Position the computer upright on a at surface.
2. Disconnect the following cables from the system board:
(1) Display cable
(2) Optical drive connector cable
3. Remove the 3 Phillips PM2.5×7.0 screws (1) that secure the system board to the computer.
4. Lift the bracket from atop the USB-Type C port (2).
5. Rotate the right side of the system board upward (3).
6. Disconnect the power connector cable from the bottom of the system board (4).
Component replacement procedures 75