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1st thing to confirm is that electro, if its open the vert will deflection will suffer.
next are you testing it with the convergence board plugged in?
I would not worry about the VDR, but if everthing else check out you can remove it and test. I use a cap tester to apply a voltage to it, and check the current thru it. IIRC its about 1ma at 800v. I doubt its a problem unless its shorted.
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