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SGH-E720 Flow Chart of Troubleshooting
2-
8
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2-1-5. Speaker Part
Is the terminal of speaker O.K?
NO
Replace the speaker
Are there any signal
at the pin #40,42 of CN507?
NO
Check the LCD module
& Replace CN507
There is no sound from speaker
YES
YES
The type of sound from
the speaker is Melody?
YES
NO
Are there any signal
at the pin #1,5 of U403?
Are there any signal
at the pin #3,15 of U403?
Check
U402,
U401,
U201
NO
NO
Pin #2 of U403
is Low?
Pin #2 of U403
is High?
Check U403
NO
NO
YES
YES
YES
YES
END
Pin 14 of U403
is 3.3V?
YES
Pin 3 of U303
is High?
NO
Check U303
YES
NO
Check U401