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I been caught by a Toshiba set with a vertical fault before. I thought I'd replaced all the relevent caps. I had missed one that was nowhere near the vertical IC, but connected to it's input. That said I'm working without schematics more often than not and I doubt something as simple as a failed cap could cause such severe distortion.
Could the fact the fault became permanent after you installed new parts suggest a temperature sesitive component somewhere was disturbed in the process?
Have you checked the yoke with a shorted turns tester?
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