4. TROUBLE SHOOTING
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Copyright © 2013 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 Rubber
2nd Mic Hole
1u
C250
C251
1u
C252
1u
AH29
AK28
AF26
AF25
AE25
AJ27
AK27
AK25
AJ25
AH27
AJ23
AJ22
AJ19
AJ18
AF16
AJ17
AJ20
AG18
AUX_YM
AUX_YP
AUX_IN0
AUX_IN1
AUX_IN2
AUX_IN3
AUX_IN4
REFN
REFP
VMIC
AU_VIN0_N
AU_VIN0_P
AU_VIN1_N
AU_VIN1_P
AU_VIN2_N
AU_VIN2_P
EARBIAS
ACCDET
C253
1u
1u
C264
C263
1u
C260
1u
C261
1u
RF_TEMP_ADC
VMIC
EARMIC_BIAS
HOOK_DETECT
MIC2_P
PCB_REVISION
MIC2_N
EARMIC_P
EARMIC_N
USB_ID
MIC_P
MIC_N
AVDD25_VDAC
Check C263, C264 and VMIC voltage level (C251)