LG FH2 - Page 34

3-17
ELECTRICAL TROUBLESHOOTING GUIDE
NO AUDIO OUTPUT
YES
YES
YES
YES
MIC function
END
Check R15, R42, L326, JACK301.
Check L38, L40, IC5.
Check IC4.
NO
NO
NO
Check IC105 pin78(3.3 V)
after inserting MIC.
Check IC5 pin3(5 V), pin4(3.3 V).
Check MIC signal L35.