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SGH-E720 Flow Chart of Troubleshooting
2-
11
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2-1-7. Mp3 Display Part
NO
Replace the Earphone
Are there any signal
at the pin #8,12 of U403?
NO
Check C439,440,474,475,452,448
& L401,402, V400,401
There is no MP3 sound from Earphone
YES
YES
Are there any signal
at the R350,351?
NO
The voltage of C334
is 3.3V?
NO
YES
YES
END
Check the U301
Are there any signal
at the pin #4,6 of CN400?
Are there any signal
at the pin #9,13 of U403?
NO
YES
Pin #10 of U403
is Low?
NO
YES
Pin 14 of U403
is 3.3V?
YES
Pin 3 of U303
is High?
NO
YES
Check
U201
Check
U403
Check
U303
END
NO
Check U401
Check
R350,351
The voltage of C344
is 2.5V?
NO
YES
Pin 2 of U302
is High?
Check
U302
NO
YES
Check
U201
Check the U300
Check the U201