Well I compaired the voltages, yellow 82 v bright down screen still lit, green 75 v red 472v , orange 285v I assume focus , black and brown heater. No 45v or 0 . The bright pot measures 135k but it's still lit no matter which way it's turned and the 270k resistor is good . I'm wondering if whatever is going on with the brightness has anything to do with verticle.
the 120v on the bright pot is there and the other end has a wire from there to the verticle hold pot which is tied to ground.