LG LG-P970 - Page 155

4. TROUBLE SHOOTING
- 155 -
Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4.12.5 Ear-MIC troubleshooting
Ear MIC control signals are generated by TWL5034 (U402), amplified by WM9093 (IC601). The power is generated by
external LDO (U403) which is controlled by OMAP3630 (U301).
Reconnect the VCAM FPCB. and check the Headphone Sound & MIC.
END
Yes
START
All sounds OK
END
Change the VCAM
FPCB
Yes
No
Check the
waveform of TP1.
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~2.2V
OK?
No
Ear sound is OK?
Check the Audio LDO or Audio subsystem IC or Main PCB
YesYes
Yes Yes