Mp3 Display Part - Samsung SGH-E720 Service Manual

2-1-7. Mp3 Display Part

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