LG E900 Service Manual page 120

4.13.5 Microphone for headset
MIC for Headset path as below:
Headset MIC signal (MIC2P)
HS_MIC_BIAS_EN U801(2.1V LDO)
J801 (Headset Connector)
Start
Insert Headset
& Make a call
YES
MIC_BIAS(TP1) is 1.6~1.8V ?
YES
make some sound or
voice to MIC
YES
Can you scoping some
sound signal at TP2?
YES
Work well?
YES
END
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Only for training and service purposes
HS_MIC FB801 J801 (Headset Connector)
TP1 (MIC BIAS raise to 1.6V~1.8V)
NO
Change the Main b'd
NO
Change the Main b'd
NO
Change the Ear-mic
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4. TROUBLE SHOOTING
LGE Internal Use Only