LG LG-D175F - Page 127

3. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
Check Main Mic hole.
Check FB6920 and MIC_Bias level (R6622)
R6623
DNI
R6920
0
DNI
R6622
MIC6921
6
5
4
3
2
1
OUT
G1
G2
G3
PWR
G4
D6922
33p
0.1u
C6703
MIC6920
6
5
4
3
2
1
OUT
G1
G2
G3
PWR
G4
C6920
DNI
C6921
33p
FB6920 1800
MIC_IN1_P
MIC_BIAS_1
MIC_IN1_N
Rev.1.0
Rev.1.0
1005 -> 0603(DR)
Rev.1.0
0903_change
Dual only
0903_change
single only
0603 change
GND Close to MIC
MIC6920