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Okay, I can forget the blue shaping control. I found service info for a similar chassis that says it's factory pre-set and not to touch it.
Anyway, the CRT is in better shape than I thought. I fixed the cold joint on the left horizontal blue control and re-installed the convergence board. However, I'm having trouble with blue static convergence, the up/down control. I can get red and green to sync no problem, but I can't get blue spot-on no matter what I do. A resistor in the area of the cold joint gets very warm and the knob on that control was discolored and broke off when I tried to adjust it. Perhaps that resistor has gone bad?
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