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Flow Chart of Troubleshooting
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10-20
10-6. Speaker Part(Melody)
Speaker does not work
Yes
No
Resolder or Replace U601
U601 pin 1,7,8 and
pin 13~16 = 4.2V ?
Yes
Check the signal at
PIN R628, R629 of U601
IF there is no signal,
resolder or replace U601
No
Check pin 7, 9 at U603
Does it Work?
Yes
Resolder or replace U603
No
Yes
Resolder U602
No
Check all power source
related U602 Does it
work correctly?
Change the Speaker
No
Yes
Is Speaker working?
Resolder U602
No
Yes
Yes
Check pin 35,36 at
U602 Is there signal?
END
Содержание SGH-I740c
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