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SGH-E770 Flow Chart of Troubleshooting
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2-
15
2-1-7. Mp3 Display Part
NO
Replace the Earphone
Are there any signal
at the pin #4,16 of U408?
NO
Check TA461, 462
and the pin #1 ,4 of ZD401
There is no MP3 sound from Earphone
YES
YES
Are there any signal
at the C416, 417?
NO
The voltage of TA410
is 3.3V?
NO
YES
YES
END
Check the U301
Are there any signal
at the pin #4,6 of EAR400?
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 U303
is High?
NO
YES
Check
UCP201
Check
U408
Check
U303
END
NO
Check UCP301
Check
C416, 417
Check the EAR400
Check the UCP201