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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
2nd Mic Hole located on Main PCB Top Side..
It’s operating handset voice call and speakerphone
In case of Test menu, loopback 2nd Mic test and Camcorder recording.
2nd Mic Hole
<Main Top>
2nd Mic Rubber
VA6903
DNI
R6925
VA6902
2.2K
R691
3
100
R6912
R6911
100
R6910
2.2K
C6915
2.2u
C6914
39p
C6911
39p
39p
C6910
MIC6921
2
1
R6909
1K
MIC_BIAS_1
MIC_IN3_N
MIC_IN3_P
Check MIC_BIAS_1 voltage level (R6909)