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Originally Posted by compucat
I have had a chance to look into the vertical problem and it is indeed the vertical output transformer. One of the convergence secondaries appears to be shorted somewhere. When in the circuit, there is no vert. sweep, the two 2200 ohm resistors feeding 410V from the power supply start smoking and the transformer gets hot and emits an odor where this secondary winding connects. When I disconnect the winding, I have restored vertical sweep and everything is stable. I am going to replace the vertical transformer, the two power supply resistors and those 1000V caps as a preventative.
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I would think that the problem is that whatever the convergence secondaries drives has a short. Sounds like the vertical output transformer works fine when you disconnected that secondary. I'm thinking that the convergence secondary is part of the vertical output transformer, Yes?