3. TROUBLE SHOOTING
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Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. Check Mic Rubber, MIC Mesh. Voice Signal OK?
2. Check parts about Mic Bias(VA6923_TP11) works well (about 1.77V) ?
3. Check parts about Mic Output (FB6920_TP12) works well ?
– waveform moves with oscilloscope
MIC Rubber
Front Assembly
<Main Bot>
Main MIC
TP11
TP12
VA6920
VA6923
MIC6920
EAB62909301
SPH0611LR5H
5
4
3
2
1
OUT
G1
G2
G3
VDD
FB6920
1800
33pC6920
C6921 33p
VA6921
DNI
MAIN_MIC_P
MAIN_MIC_N
MAIN_MIC_BIAS
12/20
Lower FPCB assigned
TP12
TP11
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