LG D337 - Page 93

4. DOWNLOAD
- 93 -
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Only for training and service purposes
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Check Main Mic hole.
4.TroubleShooting
Check Main Mic hole
Check
Main
Mic
hole
.
FB6921
C6922
Check FB6921, VMIC voltage level (C6922)
C4111
C4112
‐ 20 ‐
Check C4103, C4104
4.TroubleShooting
Check Main Mic hole
Check
Main
Mic
hole
.
FB6921
C6922
Check FB6921, VMIC voltage level (C6922)
C4111
C4112
‐ 20 ‐
Check C4103, C4104
0.1uC4105
C4106 0.1u
C4103
1u
1u
C4104
1
2
C4111
1u
1
2
1u
C4112
1
2
MIC_IN1_P
EAR_MIC_JACK
MIC_IN1_N
MIC_IN2_N
MIC_IN3_N
MIC_IN3_P
33pC6923
1
2
MIC_BIAS_1
FB6921 1800
1
2
O
G1
G2
P
MIC6921
4
3
2
1
VA6922
MIC_IN3_N
MIC_IN3_P
GND Close to MIC
C6922
1
2
0.1U
VA6920
2
1
R6923
2
1
0
VA6921
2
1
Check C4103, C4104
Check FB6921, VMIC voltage level (C6922)