Samsung SGH-E740S Service Manual page 49

9-6. Speaker Part(Melody)
Speaker does not work
U601 pin 7 = 2.9V?
Check the Clock signal at
Pin 1 of TCX100(26MHz)
U601 pin 15,17 ≒ 1.8V
(When U601 operating)
HCD500 pin 2,3 ≒ 1.8V?
(When U601 operate)
L104 pin 1, 2 ≒ 1.8V
Is the Speaker working?
Yes
Yes
Yes
Yes
Yes
Yes
END
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No
Resolder or replace U601
No
Check the clock generation circuit
(related to U101 and TCX100)
No
No
No
Resolder or change L104
No
Resolder of change the Speaker
9-13
Flow Chart of Troubleshooting
Resolder U601
Resolder HCD500