Microphone Trouble - LG GM360i Service Manual

4.7 Microphone trouble

Check Points
-Microphone hole
-Mic. Bias & signal line
TP2
MAIN_MIC_P
MAIN_MIC_N
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Only for training and service purposes
MIC
TP2
TP1
TP1
VMIC_P
C310 C307
C302
47pF
27pF 27pF
VMIC_N
TP2
FB304 FB300
L302
MIC300
78/147
C338 22n
C339 22n
L302
0.1uH
C303
VA300 VA302
1uF
TP1
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4. TROUBLE SHOOTING
MIC300
1
OUT
2
G1
3
G2
4
G3
5
PWR
6
G4
LGE Property
LGE Internal Use Only