sydres wrote on 2026-09-15, 04:32:

Should I check capacitors?

Yes, the built-in power supply needs to be checked first.

sydres wrote on 2026-09-15, 04:32:

I have tried a different VGA cable but haven't tried DVI.

I would stop trying to turn it on with other cables, video cards, etc., as the issue could get worse.
A faulty high voltage capacitor can damage other components.

Past the late 90's, very few LCD monitors came with known good Japanese electrolytic capacitors.

So chances are likely that the monitor's PSU is due for a recap. Or, on more rare occasions, it could also be failed electrolytic capacitors on the video/logic converter board too.

I'm sure there are probably threads about this on badcaps.net... but IMO it's better to open up the monitor and post some good pictures of the circuit boards here so that we can see exactly what you are dealing with.

Thank you for the answers.i opened the monitor and found that it has a single obviously bad 220 microfarad 25v electrolytic on the power board, slightly bulged. I didn't have any of that size in my parts supply so I ordered some. The logic board had what looked like fungus on it, it's probably just dried out leftover flux but had the look of fungus on old optics. I cleaned that with isopropanol. The other boards look good. Now I have to find where I put the replacement tips for my soldering station.

After testing it appears that Replacing the capacitor seems to have fixed the issue. I did have to spend whet seemed an excessive amount of time to get the old solder to melt probably should have done a preheat. And as usual it took longer to reassemble than the actual repair.