3. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
1. Check Mic hole and mesh filter on Battery Cover and Mic Cap in Front Ass’y. Voice Signal OK?
2. Check parts about Mic Bias(VA10011_TP12) works well (about 1.77V) ?
3. Check parts about Mic Output (FB10006_TP11) works well ?
– waveform moves
Main PCB
Front Assembly
Battery Cover Assembly
Sub MIC
MIC Mesh
MIC Cap
TP11(MIC output)
TP12(MIC Bias
About 1.77 V)
33p
C1003
3
C1002
9
33
p
VA10009
VA10010
VA10011
FB10006
1800
MIC10003
4
3
2
1
O
G1
G2
P
SUB_MIC23_BIAS
SUB_MIC3_N
SUB_MIC3_P
Sub_MIC3
TP11(MIC output)
TP12(MIC Bias
About 1.77 V)