LG LG-E730 - Page 154

4. TROUBLE SHOOTING
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4.18.5 Ear-MIC trouble
Ear MIC control signals are generated by QTR8200 (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 TP2
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