[TinCanAlley]

Originally Posted by old_tv_nut

The jail bars frequency is in the 100 kHz or so range. It takes significant inductance to resonate at that frequency with the caps that are across the diodes. Take your spare cap and connect it across an existing diode cap and see if there is any difference. You don't have to remove the existing cap to see if the capacitor across the diode is having any effect on the jailbars. If you do see an effect, you have a starting point for investigating from there. If you don't see any effect on the jailbars, you can stop wasting your time and look for some other cause.

This advice is based on the caps in question being across the diodes as you describe and not from one end of the diode to somewhere else.

There are two that fit the criteria. The one on the damper diode and the one on the boost rectifier for the 240V.

The damper diode will have to be done from the bottom, but the boost can be done from the topside. The diode and cap for boost are across connection 13 of the terminal strip by the flyback. I can just connect the cap to those for testing.

Can I use clip-on leads to them? The damper diode is from collector to ground and the SM has the collector at 125V and the boost is 240V.

I find it interesting that the new flyback is one revision newer than current, has the same resistors, capacitors, etc..... Yet, it says when replacing my current version, I need to remove the 600pf 2KV capacitor. The capacitor on mine is on the FB side of the boost voltage to ground. Guess they figure since the supply line going to the diode has one of those capacitors across it, thing the supply side of it to ground isn't necessary?