LG -P940 Service Manual page 111

4.12.3 Main MIC troubleshooting
Main MIC signal is generate by MEMS MIC on RF-key PCB
Check the MIC signal by loop-back test
Check the MIC hole to
make clear the voice signal path.
Change the RF-key PCB.
And check the voice siganl.
Change the TWL6040(U803)
Is the voice siganl OK?
Change the mainboard
LGE Internal Use Only
START
or voice recorder
Is vioce signal OK?
No
Is voice signal OK?
No
No
Yes
END
Yes
END
Yes
END
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4. TROUBLE SHOOTING
Only for training and service purposes