Mic Trouble Shooting - LG KE590 Service Manual

4.12 MIC Trouble Shooting

z MIC Operation scheme is shown below.
D2 R140 1K
MICIN
D1 R141 1K
MICIP
C1
HSMIC
E3
MICBIAS
E2
HSMICBIAS
C2
AUXI_FMR
D3
FML
G2
EARN
G1
EARP
F3
AUXO
For ECM MIC Test
MICBIAS
MIC_ABB_P
NA
C101
MIC_ABB_N
z MIC signal flow
- MIC is enable by MICBIAS
- MICBIAS Signal from ABB(U103).
- MICIN, MICIP signal from MIC(MIC100)
z Check Point
- MIC bias
- Audio Signal level of the Microphone
- Soldering of Components
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
C121 0.1uF
MIC_ABB_N
C122 0.1uF
MIC_ABB_P
L101
100nH
MICBIAS
HSMICBIAS C123
100p
RADIO_R
RADIO_L
RCV_N
RCV_P
C100
NA
100nH
L101
C102
0.1u
C104
0.1u
100nH ZD100
L102
C109
27p
1uF
C107 27p
GRM36Y5V105Z6.3PT
4. TROUBLE SHOOTING
HSMICIP
R140
C121
L100
100nH
MIC100
1
OUT
2
G1
3
G2
4
PWR
5
G3
SP0204LE5-P
C110 C111
100p 10u
VA100
EVLC14S02050
- 91 -
R141
C122
LGE Internal Use Only