3. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
1. Check Mic hole, PAD and Mic Cap. Voice Signal OK?
2. Check parts about Mic Bias(FP203_TP10) works well (about 1.77V) ?
3. Check parts about Mic Output (FB202_TP9) works well ?
– waveform moves with oscilloscope
MIC Cap
MIC Pad
MIC Pad
MIC Cap
Main MIC
TP9
TP10
1800
FB203
FB202
1800
MIC200
4
3
2
1
O
G1
G2
P
VA202
VA203
VA204
R212
0
DNI
C207
C215
33p
33p
C209
MAIN_MIC_P
MAIN_MIC_N
MAIN_MIC_BIAS
Main MIC
TP9(MIC Out)
TP10(MIC Bias)