LG -P970 Service Manual page 155

4.12.5 Ear-MIC troubleshooting
Ear MIC control signals are generated by TWL5034 (U40), 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.
Ear sound is OK?
No
Check the TP1.
Bias range 1.6V~.V
OK?
No
Check the Audio LDO or Audio subsystem IC or Main PCB
LGE Internal Use Only
START
Yes
Ear sound is OK?
No
Check the
Yes
waveform of TP1.
Waveform is OK?
No
All sounds OK
END
Yes
Hook detect is OK?
No
Yes
Check the TP3.
Bias range 1.0~1.4V
OK?
No
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4. TROUBLE SHOOTING
Yes
END
Yes
Change the VCAM
FPCB
Only for training and service purposes