LG -P768 Service Manual page 81

4.11.3 Main MIC troubleshooting
Main MIC signal is generated by MEMS MIC on RF-key PCB
Check the MIC signal by loop-back test
or voice recorder
Check the MIC hole to
make clear the voice signal path.
Is vioce signal OK?
No
Change the RF-key PCB.
And check the voice siganl.
Is voice signal OK?
No
Change the TWL6040(U803)
Is the voice siganl OK?
No
Change the mainboard
LGE Internal Use Only
START
(TP1)
(TP2)
Yes
Yes
Yes
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4. TROUBLE SHOOTING
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