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SGH-D720 Flow Chart of Troubleshooting and Circuit Diagrams
2-
15
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2-1-6 Audio-Microphone Part
Check the reference
voltage on mic path
C231=1.9V
Reassemblage microphone
NO
resolder or change
(R259,C223,R223,C231,R233)
NO
Check U500
NO
YES
YES
Microphone does not work
END
YES
Check the assembled
status of microphone.
Is microphone ok?
R256
20
2
V
10
2
V
R259
R221
MIC+
C231
VDD_30CD
C226
R233
MIC
R254
C223
R226
R253
R255
R230
C232
R223
R231
R227
MIC2
AUXINP
MIC2N
AUXINN
AUXOUTN
MICINP
MIC1
MIC1N
MICINN
MICOUTN
MIC1N
AUXOUTP
MIC_BIAS
MICOUTP
MIC1