This CRT was working fine for 3 months and then one day it started taking around a minute or two to turn on. Some days it wouldn't even turn on. It did this for about a week and then it started sparking inside of the screen/tube refusing to turn on.

Here's an example of it sparking inside the screen.

The sparking would act differently if my other monitor was turned on (24" 60hz lcd). The spark would disperse around the screen, rather than in the middle.

Here's an example of that.

Here are my theories as to why this is happening. One, the flyback overheated or isn't giving enough voltage to the screen. The wire that goes from the flyback to the anode cap had this weird black dust on it. This black dust was in the casing, around the glass of the tube, and on the flyback/anode wire. Not sure if this was just dust, or burnt marks, because it did have a weird smell...

Second theory is maybe the outlet isn't giving enough juice(?)

Third theory would be that the anode cap needs regreasing since there's a dark shaded circle around the tube. I can wipe this circle off with my finger, not sure if I should be doing that so I left it alone.

The CRT casing is off at the moment, and I cleaned the motherboard and capacitors of dust (for the most part). It doesn't look like any of the caps are leaking. There's some weird blue stuff that looks like glue coming out of the focus and brightness knobs on the flyback, not sure if that's glue or leakage. Here's a photo of it.


What do you guys think? Is it the flyback or does it need to be recapped? Any information helps, thanks!

 

That "blue glue" was to hold the knobs in place. You should completely stop turning it on because you will forever burn the crt.

 

That "blue glue" was to hold the knobs in place. You should completely stop turning it on because you will forever burn the crt.

Oh snap, we don't want that happening. This was the best looking CRT I ever laid eyes on, it'd be a shame to get it working again only to see the screen is burnt into These video's were taken late 2022 btw, and I'm desperately trying to game on this again.

 

THe Flyback and any doubler, tripler contamination causes creepage to high voltage breakdown. It must be cleaned properly and coated with silicone. Any carbon residue can be conductive. Beware of residual HV on storage caps and discharge for an extended time (absorption time)