4. TROUBLE SHOOTING
- 154 -
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4.18.5 Ear-MIC trouble
Ear MIC control signals are generated by QTR800 (U1001). Amplified by WM9093 (M800).
The power is generated by PM8058(U403).
Reconnect the Earjack FPCB and check the Headphone Sound & MIC.
END
Yes
START
All sounds OK
END
Change the
Earjack FPCB
Yes
No
Check the
waveform of TP
Waveform is OK?
No
Ear sound is OK?
Hook detect is OK?
No
Check the TP3
Bias range 1.0~1.4V
OK?
No
No
Check the TP1
Bias range 1.6V~.V
OK?
No
Ear sound is OK?
Check the Audio LDO or Audio subsystem IC or Main PCB
Yes
Yes
Yes
Yes