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I checked this TV some more and I think the problem may be in the brightness limiter circuit. I noticed that someone has already replaced the 220 ohm resistor that connects to the center terminal of the brightness limiter control. When turning the control, there is almost no change in the brightness until it's turned all the way down and there's not much more change, even at that. I'm going to check the resistors and a 7.5 volt zener diode that's in this circuit. When I measure voltage across the 7.5 volt zener diode, I get a reading of zero.
Once I get this problem solved, I'll work on the jittery picture.
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