LG -P768 Service Manual page 83

4.11.4 SUB MIC troubleshooting
Sub MIC signal is generate by MEMS MIC on Main 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 sub mic.
Is voice signal OK
No
Change the TWL6040(U803)
Is the voice signal OK?
No
Change the mainboard
LGE Internal Use Only
START
(TP3)
(TP4)
Yes
Yes
Yes
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4. TROUBLE SHOOTING
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