LG GB210 - Microphone Trouble

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Only for training and service purposes
4. TROUBLE SHOOTING
TEST POINT
CIRCUIT
TP3
TP1
TP6TP4
TP5
U300
TP2
4.15 Microphone Trouble
CIRCUIT
MICROPHONE PATH SELECTION
0.1uF
C324
C3131u
2V8_VEXT
C311
1u
C312
1u
NC1
5
7
NC2
2
NO1
10
NO2
1
V+
DG2735DN-T1-E3
U300
COM1
3
COM2
9
GND
6
4
IN1
8
IN2
C319
0.1uF
MM_MICP
MIC_PATH_SELMAIN_MICP
MAIN_MICN
VINNORP
VINNORN
10u
C310
EVLC14S02050
VA300
2
G1
G2
3
O
4
P
1
MIC300
SPU0410HR5H-PB
100nH
L300
2V5_VMIC
100nH
L303
39p
C302
L302
100nH
C309
39p
C303
22n
C300
22n
C305
39p
MAIN_MICP
MAIN_MICN
TP5
TP4
TP6
TP3
TP2
TP1