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

5. Lift the heat sink from the system board (5).
NOTE: Thoroughly clean thermal material from the surfaces of the system board components (1) and
the heat sink (2) each time you remove the heat sink. All heat sink and processor spare part kits include
thermal material.
Reverse this procedure to install the heat sink assembly.
Component replacement procedures 81