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SGH-S400i Flow Chart of Troubleshooting
2-
16
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2-1-6. Microphone Part
Microphone does not work
Is the assembled status
of Microphone O.K?
Yes
Reassemble the microphone
No
Check the DC bias voltage
on Mic path.
No
Resolder or change
R352, R359, R342, R353, R354,
R355, R358, C365, C369
Is microphone OK?
No
Check UCD307
END
Yes
R352 ≒ 2.3V
Yes