LG D405 Service Manual page 82

3.9.4 SUB MIC troubleshooting
Sub Mic. path as below :
MSM8226 -> WCD9302 MIC1_INP/ MIC1_INM -> Mic
Headphone icon display on Upper
right LCD ?
Check Mic Power in Main Board
TP1(MIC_BIAS_1)
Replace component U6100
LGE Internal Use Only
START
No
No
End
Yes
Refer to 3.9.5 Ear-MIC troubleshooting
Yes
Check Mic signal in Main Board
TP2(MIC3_IN_P)
Replace component MIC6920
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3. TROUBLE SHOOTING
Yes
No
Only for training and service purposes