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Without some kind of video it would be hard to tell if you have sync. You do have sweeps and HV, and working audio amp. The video detector diode is a frequent problem, that would kill the sound also. Could be a mistake in re-capping of course.
A oscilloscope would be handy to find out if you have a signal at the video detector. You would need a scope that could display at least 50MHz to see the video IF. However if you had a demodulator (detector) probe you could see any video on it with only a 5MHz scope.
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