LG -P970 Service Manual page 151

4.12.3 Main MIC troubleshooting
Main MIC control signals and power are generated by TWL5034 (U40).
Change the ANT. FPCB
LGE Internal Use Only
START
Reconnect the ANT. 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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