HP ProBook 640 G2 Notebook PC, HP ProBook 645 G2 Notebook PC, HP ProBook 650 G2 Notebook PC and HP ProBook 655 G2 Notebook PC - Maintenance and Service Guide

b. Detach the microphone board (2) from the display enclosure.
The microphone board is available using spare part number 840691-001.
Reverse these procedures to reassemble and install the display assembly components.
Display assembly 87