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4-
8
SGH-X400 Flow Chart of Troubleshooting
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5. Microphone Part
Check the
reference voltage
on mic path
C410 ≒ 2.0V
Microphone does not work
Resolder microphone
END
No
Yes
Yes
Yes
Yes
Is microphone ok?
No
Check U701
check the soldered
status of
microphone.
Check the
pin 42 of
U102 is
"2.8V"
Resolder or change R413,
C420, R412, R411, R408,
C410
No
No
Yes