LG L602i Service Manual page 110

4.16.4 Microphone for Main MIC
Main Microphone path as below:
MIC -> C508,C509 -> MSM6250A -> MIC feed back gain logic -> MSM internal CODEC
MIC
SP0204LE5-PB
G3
5
PWR
C508 22n
4
G2
3
G1
C509 22n
2
OUT
1
U501
C510 C511
R504
33p 10p
0
Start
Make a call
MIC_BIAS(C506,
C507) is 1.8V
make some sound or
voice to MIC
Can you scoping some
sound signal at C508,C509
Change the Main B'd
MICBIAS
MIC1N
MIC1P
NO
Change the Main B'd
YES
NO
Change the MIC
YES
NO
Work well?
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4. TROUBLE SHOOTING
C225
Close to MSM
YES
END