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I believe the TV may be at fault here. This aging TV has a vertical problem, The horizontal bans you describe are common on an aging Zenith TV. You need to find an electronic enthusiast to correct this. Tell them to resolder the vertical IC and replace those capacitors that are near and next to the vertical IC. And have them replace the capacitors in the power supply. They will include a 25 volt 100 MF cap and a 35 volt 22 Mf cap. These are located very near the STR 5041 regulator on a large heat sink. Have them replace the high voltage deflection cap that is about 200 volts at 1 Mf, near the flyback transformer. And on the other end of the board near two heat sinks (one of these is the vertical IC heat sink) there is a 25 volt 220 Mf cap that is dead by now. resolder any and all bad grounds. Please save this TV and give it the longevity it deserves. Thanks for asking and show a few hands of support.