Microphone Trouble - LG MG295 Service Manual

4.14 Microphone Trouble

TEST POINT
CIRCUIT DIAGRAM
CLOSE TO MIC
MIC_P
MIC_N
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Only for training and service purposes
Figure 4.14
2V5_VMIC
R214
1K
R218
2.2K
R222 100ohm
C212
39p
C217 0.1u
R223 100ohm
R225
2.2K
4. TROUBLE SHOOTING
C212
R222
R214
C217
R223
2V8_VEXT
U202
NLAS5223BMNR2G
1
VCC
2
MULTI_MIC_P
NO1
3
MIC_P
COM1
4
MIC_PATH_SEL
IN1
5
VINNORP
NC1
C206
C209 C205 1u
10u
39p
C213
39p
- 73 -
MIC200
10
MULTI_MIC_N
NO2
9
MIC_N
COM2
8
MIC_PATH_SEL
IN2
7
VINNORN
NC2
6
GND
OB4-15L42-C33L
2
1
MIC200
LGE Internal Use Only