LG LG-P970 - Page 151

4. TROUBLE SHOOTING
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4.12.3 Main MIC troubleshooting
Main MIC control signals and power are generated by TWL5034 (U402).
Reconnect the ANT. FPCB.
and check the Main MIC.
Voice recording is OK?
No
END
Yes
START
Check the TP1.
Bias range 1.8V~2.2V
OK?
No
Change the Main PCB
Change the ANT. FPCB
Yes
Voice recording is OK
END