LG -E455 Service Manual page 141

Check Main Mic hole.
VMIC
EARMIC_BIAS
LGE Internal Use Only
PCB_REVISION
USB_ID
RF_TEMP_ADC
Check C260, C261 and VMIV voltage level (C251)
MIC_N
MIC_P
C251
EARMIC_N
1u
EARMIC_P
MIC2_N
MIC2_P
HOOK_DETECT
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4. TROUBLE SHOOTING
AG18
AJ20
AJ17
AF16
AJ18
AJ19
AJ22
AJ23
C250 1u
AH27
AJ25
C260
1u
AK25
C261
1u
AK27
C252
1u
AJ27
C253
1u
AE25
C263
1u
AF25
C264
1u
AF26
AK28
AH29
Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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
AVDD2
ACCDET