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This does make sense if you understand that the black bar is always part of the video. The black bar is where the horizontal video sync input pulse is in the video signal. The white bar in your case IS coming from the horizontal sweep signal, it always is at the start of the sweep. Looks to me that part of the horizontal sweep sawtooth signal is getting into the RF-IF-Detector area.
Are there sweep wires (like yoke) near that area?
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