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This is a long shot, but is there a chance the video detector diode coulda been chopped out and then re-installed backward?
I was goin' by your recounting of years ago when the set had been "butchered" and various parts cut out and then re-installed. A reversed v detector diode will display some really bizarre symptoms such as you describe.
(Not sure about the FM audio coming thru, though.) Can't tell from the partial schematic, but does that set have intercarrier sound (sound taken off after the vid detector), or the earlier 'split sound' (a dedicated sound IF strip straight from the tuner)?
Ditto what Dave says about not being overly concerned about those voltages.
Last edited by old_coot88; 10-15-2014 at 08:33 PM.
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