LG U830 KU830 Service Manual page 124

4.18.4 Microphone for Main MIC
Main Microphone path as below:
MIC -> C203 -> MSM6275 -> MIC feed back gain logic -> MSM internal CODEC
MIC
SP0102BE3
5
G3
4
U200
PWR
3
G2
2
G1
1
OUT
Start
Make a call
MIC_BIAS(C200) is 1.8V
make some sound or
voice to MIC
Can you scoping some
sound signal at C203
YES
Change the Main B'd
MICBIAS
C200 C201
10u
47p
MIC1N
C204
22n C202
NA
22n C203
MIC1P
NO
Change the Main B'd
YES
NO
Change the MIC
NO
Work well?
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4. TROUBLE SHOOTING
SDCC_DAT1_GPIO99
SDCC_DAT2_GPIO100
SDCC_DAT3_GPIO101
MDP_VSYNC_SECONDA_GPIO104
MDP_VSYNC_PRIMARY_GPIO105
YES
END