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SGH-E770 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 #36, 38 of HDC503?
YES
Are there any signal
at the pin #1,5 of U408?
YES
Pin #2 of U408
is Low?
YES
Pin 8 of U301
is High?
NO
Check UCP301
END
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YES
YES
The type of sound from
the speaker is Melody?
NO
NO
YES
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NO
Replace the speaker
NO
Check the LCD module
& Replace HDC503
Are there any signal
at the pin #3,15 of U408?
NO
Check
UCD403,
NO
Pin #4 of UCP201
UCP301,
UCP201
Check U301
NO
YES
is High?
YES
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