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Flow Chart of Troubleshooting
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9-
18
9-1-7. Mp3 Display Part
NO
Replace the Earphone
Are there any signal
at the pin #4,16 of U408?
NO
Check R514, R515
and VR508, VR510
There is no MP3 sound from Earphone
YES
YES
Are there any signal
at the TA402, TA403?
NO
The voltage of TA401
is 2.8
NO
YES
YES
END
Check the U405
Are there any signal
at the pin #5,7 of IF501?
Are there any signal
at the pin #3,15 of U408?
NO
YES
Pin #2 of U408
is Low?
NO
YES
Pin 14 of U408
is 3.3V?
YES
Pin 4 of U410
is High?
NO
YES
Check
UCP200
Check
U408
Check
U410
END
NO
Check U300
Check
TA402, TA403
Check the IF501
Check the UCP200