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you read the base voltage, look for the emitter voltage this would be normal mode no signal (raster).
Yes I noted the connection to the convergence board, and no I do not know if that is related.
1st things 1st get that emitter voltage my guess is changing from normal to setup alters those voltages as a means to bias the transistor to cut off more when in setup mode.
as far as scoping I would start by seeing if the sam wave form matches, if it does then thats a dead end, if not then you would just start working back towards the flyback. That horz pulse at the convergence board will will prob look a lot like the one you see in my video which is also a flyback pulse for convergence. PP may be different but I suspect the shape will be about the same.
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