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What checking with the scope would tell is if the video is getting to the cathode of the CRT at the needed amplitude for a picture, w/o any distortion, if it is, the sync may be SO FAR out of wack that it MIGHT obscure video display ( unlikely, but who knows.) , or the voltages at the CRT are so far off, it just can't let it show video, assuming that it's good enough to in the first place.
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