LG -D385 Service Manual page 139

Check Main Mic hole.
Check MIC_BIAS_1 voltage level (R6919)
MIC_IN1_P
MIC_IN1_N
LGE Internal Use Only
100
R6921
C6920
39p
100
R6922
C6924 C6921
39p 39p
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3. TROUBLE SHOOTING
MIC_BIAS_1
C6925
2.2u
VA6900
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Only for training and service purposes
1
2
MIC6920
VA6901