LG LG-V909DW - Page 96

4. TROUBLE SHOOTING
- 96 -
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ͽ͸Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΀ΟΝΪ
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ͽ͸Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΀ΟΝΪ
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ͽ͸Ͷ ͺΟΥΖΣΟΒΝ ΆΤΖ ΀ΟΝΪ
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Q800
21 3D
G
S
R854
18K
R848 0
U803
5
3 2
4 1
VOUT
VDD
GNDCE
DNGP
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
21 3D
G
S
R854
18K
R848 0
U803
5
3 2
4 1
VOUT
VDD
GNDCE
DNGP
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