More screen anomalies

[Username1]

You need to get off the diodes, If it is a diode, not likely, you will have to replace it, they will test ok, but this problem is showing up at a frequency you can't replicate with a tester out of circuit.

Its some decoupling cap, or an RC, LC, circuit. Most likely an LC, yoke, possibly, High Voltage transformer greater likelyhood, Decoupling cap, some cap near an LC circuit running to ground. There are caps with a mark indicating "outside foil" this in most cases went to ground, when you recapped, did you replace using marked "outside foil" caps, and put them in the right way? (These will not be electrolytic caps, but the smaller caps.) This can be a cause of interference.

If you use a scope to try and find this, it will have to be a good one to see the ringing, it will be a pretty high frequency. You will have to have a good probe, and it will also have to be calibrated to the square wave test point on the scope, that way your probe does not effect what you are looking at.

And someone said grounds, look at grounds if there was someone in there before you doing poor solder joints.