1)Check high voltage,if missing,you get no picture.
2)Turn up screen voltage on transformer--does tube light up?
then your symptom is No Video,sound ok.
3)repair video circuit--bad IC??
hope that helps.....T.
Maybe you have defective heater line tru the CRT board! check the heater line if have a 4.5 volts or 4.8 volts! can you see the back of picture tube!?! they lights coming out at the neck of the tube! if no light! you have defective heater supply!
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