Mic Trouble Shooting - LG L240 Service Manual

4.12 MIC Trouble Shooting

z MIC Operation scheme is shown below.
D2 R132 1K
MICIN
D1 R133 1K
MICIP
C1
HSMIC
E3
MICBIAS
E2
HSMICBIAS
C2
AUXI_FMR
D3
FML
G2
EARN
G1
R318
MICBIAS
1K
C327
NA
R320 0
MICIP
27p
C329
R322 0
MICIN
R324
R323 27p C333
220K C332 220K 27p
z MIC signal flow
- MIC is enable by MICBIAS
- MICBIAS Signal from ABB(U101).
- MICIN, MICIP signal from MIC(MIC301)
z Check Point
- MIC bias
- Audio Signal level of the Microphone
- Soldering of Components
C111 0.1u
MICIN
C112 0.1u
MICIP
HSMICIP
MICBIAS
HSMICBIAS
AUXI
RCV_N
Close to MIC
C328
R319
10u
1K
MIC301
1
27p
2
C330
OSF211-42D
VA304 VA305
R325
1K
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4. TROUBLE SHOOTING
C215 C215
C215
C215
R318
R320
R322
R319