Solarstorm wrote:Might still be a shielding problem, since it's bare electronics running openly unshielded i guess or still some bad connections.
I was wondering about this from the start!
I think the important clue might be that the LCD driver board's OSD is also subject to these interferences, so it actually shouldn't be the VGA signal that produces (most) of the noise because in that case the OSD should be unaffected as well!? I'll see about some makeshift shielding (cardboard box+ aluminium foil?) for the board to test this hypothesis. I guess it could still be both the VGA signal and the board itself...
Deunan wrote:henryVK wrote:Might still be a combination of factors? or I simply need a really well made DSUB cable?
Could be an issue with the LCD driver or it's PSU as well. If the caps are failing and the power provided is noisy, it'll act up. The worse the input signal, the worse it gets. So getting the input signal to be as clean as possible is always a good thing (even if there were no other issues) but if a good quality cable is not fully fixing the problem then chances it's not the only problem you have. Oh and same goes for video cards but if you can get a stable picture on other displays and not this one then obviously it's the culprit.
Yeah, the driver board runs off the computer's PSU and the initial PSU I tested with this setup seemed to produce a lot of visible interference on my CRT even though, cosmetically speaking, the caps look just fine. Anyway, I used a way newer and supposedly decent ATX PSU and the noise cleared up a lot. I replaced the video card for one that was in better shape which reduced noise even further. I'm tempted to say that the signal is now as good as it will get, though I can't be entirely sure lacking the means (not to mention know how) to make sure the PSU and video card are 100% okay.
I could rule out the PSU by getting a 12v 2a adapter... which I was holding off on because it's exactly the opposite of what I was trying to do, running the LCD driver board off the PSU 🤣