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Even with a good scope, you may or may not be able to see the ring in the wave form. First Sams will have to had put it in the schematic, Its always possible they just don't chose to show a spot that happens to be the source of this specific problem, and second, you/he would have to be able to pick up on it, and then be able to figure out where its coming from. If it's not confined to one spot, its possible it shows up all over the set, then its back to checking individual parts. And who knows, it could be coming from the flyback, and just transmitting that into some near by improperly shielded item. Anyway, it looks like its a big enough disturbance that it can be tracked down.
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Yes you can call me "Squirrel boy"
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