Trouble Shooting - Samsung SCH-3500 series Service Manual

8. Trouble Shooting

8-1 Logic Section
8-1-1 No Power
Press PWR button.
Q905 Base input =600 mV?
U904 pin3 input = 0V?
U907 pin 5 output=3.0V?
R945 pin 4 output=3.0V?
END
NO
YES
NO
YES
NO
YES
NO
YES
SAMSUNG Proprietary-Contents may change without notice
Check Q905 and its neighboring circuits
Check U904 and its neighboring circuits.
Check U907 and its neighboring circuits.
Check R945 and its neighboring circuits.
8-1