If the neon test dave described shows light (it may sound odd but a neon bulb placed close to high high voltage AC will light without any electrical connection) then you likely had the HV trippler die. Mine lost the trippler when on...I left the room and a friend was adjusting the brightness when it just died without warning. IIRC a NOS trippler can be had for ~25 bucks on ebay if the signs point to it. If your set is a D16 chassis like mine I can give you the trippler part numbers to look for.
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