LG KP260 - Microphone Trouble

LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.15 Microphone Trouble
TEST POINT
CIRCUIT
MIC300
TP2
TP3
TP1
TP4
TP6
TP5
U301
MICROPHONE PATH SELECTION
Replace EUSY0323001
GND
NC_A1
1
NC_B1
5
9
NC_C1
NC_D1
13
NO_A0
15
NO_B0
3
NO_C0
7
11
NO_D0
2
SAB
SCD
10
14
VCC
U301
NLAST9431MT
16
COM_A
4
COM_B
8
COM_C
12
COM_D
6
1u
C302
100K R311
C310 1u
C304
0.1uF
2V8_VEXT
1u
C312
0.1uFC311
R310 100K
MAIN_MICP
SPK_MICP
SPK_MICN
MAIN_MICN
MM_MICP
VINNORP
VINNORN
MIC_PATH_SEL
SPKPH_EN
R303
47
C301
10u
C309
47p
MIC300
1
2
OBE-415L42-RC10-LGB10
VA300 ICVN0505X150FR
47p
C308
47
R306
ICVN0505X150FR VA301
DNI
C305
2.2K
R301
2V5_VMIC
1K
R300
0.1uF
C300
R307
2.2K
MAIN_MICN
MAIN_MICP
TP4
TP6
TP1
TP3
TP2
MIC300
TP5