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What is the model number to your TV? Brand name? Size of the picture tube? 14"; 19"; 20"; 21" etc. Type of the picture tube; full flat; cylindrical; semi-flat? CRT neck type? Broad or narrow?
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The model indicated has 3 picture tubes (right model?) and will blank or turn the tubes off for several reasons--almost all are protection.
In this kind of set if vertical loss of sweep (in old sets you would see just a white line left to right) it will not permit the tubes to be on as it would burn a line instantly in all three tubes screens.
If this model not likely to be a do it yourself repair.
I presume that the set is second hand?? They`ve got to fit the correct tube for safety reasons and the set is designed to work with that tube only for that size of set, HOWEVER, they may fit a regunned/refurbished or even a second hand tube in the set. Ian
If you go to this link they have any Picture tube you need for your model and they include instructions on how to remove the old Tube and install the new one. Your model has picture tubes instead of lamps. Leave them an email with your model number and which CRT (picture Tube) youre needing they respond quickly. Heres the link. http://servicemanuals.vstore.ca/