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