LG -E730 Service Manual page 150

4.18.3 Main MIC trouble
Main MIC control signals and power are generated by QTR800 (U1001).
Change the Touch FPCB
LGE Internal Use Only
START
Reconnect the Touch FPCB
and check the Main MIC
Voice recording is OK?
No
Check the TP1
Yes
Bias range 1.8V~.V
OK?
No
Change the Main PCB
Voice recording is OK
END
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4. TROUBLE SHOOTING
Yes
END
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