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4. TROUBLE SHOOTING
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Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
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Q800
2
1
3
D
G
S
R854
18K
R848
0
U803
5
3
2
4
1
VOUT
VDD
GND
CE
D
N
G
P
VDD_3V3_ALWAYS
C827
2.2u
C831
33p
R846
2.2K
VDD_1V8
R845
1M
C830
10u
R847
18K
EJ_MIC
EAR_SENSE
HOOK_ADC
M4D_DETECT
HS_MIC_BIAS_EN
Check the waveform of M4D_DETECT [TP]
M4D_Detect : Low
Q800
2
1
3
D
G
S
R854
18K
R848
0
U803
5
3
2
4
1
VOUT
VDD
GND
CE
D
N
G
P
VDD_3V3_ALWAYS
C827
2.2u
C831
33p
R846
2.2K
VDD_1V8
R845
1M
C830
10u
R847
18K
EJ_MIC
EAR_SENSE
HOOK_ADC
M4D_DETECT
HS_MIC_BIAS_EN
Check the voltage of (EJ_MIC_BIAS) TP
1.6V
TP1
TP2