Quote:
Originally Posted by bandersen
Unfortunately, nothing I've tried has had any effect on those vertical bars including what's in this service note.
Anyone have any idea what filter A3459S might consist of ?
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Bandersen, the vertical bars mentioned in the A2359S service notes are caused by the horizontal output 'transmitting' a stray signal that is picked up by the video. These can happen anywhere in the picture and even on a blank raster.
I'd bet you dollars to donuts, that the "vertical lines" pictured in the left of your two Perry Mason photos posted later, is actually video ringing. Look for loose tube shields and bad tubes (substitute, as a checker probably won't catch it) between the video detector and the CRT.
If no progress there, do a very careful voltage check of those circuits and look especially for any open (test by jumping them) electrolytics in or near the video circuit.
I've also seen overshoot on the AGC line in the IF cause a problem that looks very very similar, but this failure usually also mucks up the grey-scale, so it is a lot less likely suspect.
If you have a color bar-dot generator, use that on cross-hatch bars while testing as the picture will remain constant while you check and the vertical bars should easily trigger the ringing. If they don't I'm barking up the wrong tree.
James