LG LG-V909DW - Page 95

4. TROUBLE SHOOTING
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4.12.3 Ear-MIC troubleshooting
Ear MIC control signals are generated by WM8994(U800)
Start
Change the Ear_Jack FPCB
Change the Ear_Jack FPCB
END
END
END
Check the Main Ear-jack, and reconnect the Ear_jack FPCB
Check the Codec IC or MAIN PCB
Ear Sound is OK?
Ear Sound is OK?
Check the waveform
(Low/High) of TP1
Check the EJ MICBIAS
(TP2) Voltage is 1.6V
Ear Sound or MIC is OK?
Yes
Yes
Yes
Yes
No
No
No
No
Yes