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Have you checked to see if the Damper filter is shorted? I brought home a beautiful porthole in '86, plugged it in and started watching Johnny Carson. After 30 minutes, I heard a crackling, and turned it off. The donut was melting off the windings!
Next day, I found the problem. A .047 cap at the Damper tube measyred 47 ohms! Yes, 'twas a bumblebee. So, check for that particular cap before you install that fresh flyback. Do you have the Zenith P/N off of it?
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