Compaq Presario CQ42 Notebook PC and HP G42 Notebook PC - Maintenance and Service Guide

8 Connector pin assignments
Audio-out (headphone)
Pin Signal
1 Audio out, left channel
2 Audio out, right channel
3 Ground
Audio-in (microphone)
Pin Signal
1 Audio signal in
2 Audio signal in
3 Ground
ENWW Audio-out (headphone) 121