LG LG-E730 - Page 150

4. TROUBLE SHOOTING
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4.18.3 Main MIC trouble
Main MIC control signals and power are generated by QTR8200 (U1001).
Reconnect the Touch FPCB
and check the Main MIC
Voice recording is OK?
No
END
Yes
START
Check the TP1
Bias range 1.8V~2.2V
OK?
No
Change the Main PCB
Change the Touch FPCB
Yes
Voice recording is OK
END