Speaker Part - Samsung SGH-E720 Service Manual

SGH-E720 Flow Chart of Troubleshooting

2-1-5. Speaker Part

There is no sound from speaker
Is the terminal of speaker O.K?
Are there any signal
at the pin #40,42 of CN507?
YES
Are there any signal
at the pin #1,5 of U403?
YES
Pin #2 of U403
is Low?
YES
Pin 14 of U403
is 3.3V?
NO
Pin 3 of U303
is High?
NO
Check U401
END
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YES
YES
The type of sound from
the speaker is Melody?
NO
NO
YES
YES
SAMSUNG Proprietary-Contents may change without notice
NO
Replace the speaker
NO
Check the LCD module
& Replace CN507
Are there any signal
at the pin #3,15 of U403?
NO
Check
U402,
NO
Pin #2 of U403
U401,
U201
Check U403
Check U303
2-8
NO
YES
is High?
YES