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Can you tell if you have horizontal sync or at least that it's close? If horizontal is badly off frequency it may not be reaching the resonance point of the flyback needed to create proper HV levels. Another thing is it looks like there is a doorknob HV filter cap in that set... Sometimes those leak and or short dragging HV down.
Some sets use boost voltage derived from the flyback to power the vertical and other circuits, on those sets if one of the driven circuits has failed in a way that loads the boost line (and thus the flyback) excessively that can suppress the HV.
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