LG -P350 Service Manual page 130

4.13.5. Microphone for headset
MIC for Headset path as below:
Insert Headset Interrupt which are the signal of Headset detecting arise in EAR_SENSE
HS_MIC_BIAS:1.2~1.4V (MICBIAS)
START
Insert Headset & Make a Call
MICBIAS(C606) is 1.~1.4V?
Yes
Make some sound to MIC
The signal appear at
TP1(FB600)?
Yes
The signal appear at
TP(C317)?
Yes
END
LGE Internal Use Only
MIC signal TP1(FB605)
No
Check the Q600 or Change the Main B'd
No
Re-solder at TP1
or Check the J600
No
Check the TP
or Change the Main B'd
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4. TROUBLE SHOOTING
TP2( C317) MSM7227
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