There's no schematic available for it as far as I know, but there also isn't much on the board. What's wrong with it?

It' giving some strange noise on the picture like from old tv. I've checked everything cables etc.

moulder wrote on 2022-11-29, 11:21:

It' giving some strange noise on the picture like from old tv. I've checked everything cables etc.

Diamond Monster 3D, earlier PCB revision?

Doornkaat wrote on 2022-11-29, 11:45:

moulder wrote on 2022-11-29, 11:21:

It' giving some strange noise on the picture like from old tv. I've checked everything cables etc.

Diamond Monster 3D, earlier PCB revision?

I don't know. I think it is some OEM manufacturer.

moulder wrote on 2022-11-29, 13:12:

Doornkaat wrote on 2022-11-29, 11:45:

moulder wrote on 2022-11-29, 11:21:

It' giving some strange noise on the picture like from old tv. I've checked everything cables etc.

Diamond Monster 3D, earlier PCB revision?

I don't know. I think it is some OEM manufacturer.

I was guessing because earlier Diamond Monster 3D are known to produce interference patterns that become more obvious in TFT screens while being hardly noticeable on CRTs. They aren't defective, they just do that.
Maybe your card has similar symptoms? Can you take and upload any pics of the issue?

Doornkaat wrote on 2022-11-29, 13:36:

moulder wrote on 2022-11-29, 13:12:

Doornkaat wrote on 2022-11-29, 11:45:

Diamond Monster 3D, earlier PCB revision?

I don't know. I think it is some OEM manufacturer.

I was guessing because earlier Diamond Monster 3D are known to produce interference patterns that become more obvious in TFT screens while being hardly noticeable on CRTs. They aren't defective, they just do that.
Maybe your card has similar symptoms? Can you take and upload any pics of the issue?

I've recorded video - https://files.fm/u/br2n2c9ys.

It's not the same issue you'll usually see on the Diamond cards but it does not look like a defective card to me. Looks more like interference in the analogue signal.
Is this an open testbench or a closed system? Does anything change if you put it into a closed case (or take it out of the case if it's currently in one)?
What do others think?

Try switching to 800x600 and see if it changes. Seems like the typical "high frequency noise" issue you get when hooking voodoo2s up to modern digital displays

Have you tried the LCD auto adjust? Swapped VGA cable? Perhaps another monitor?

If so, maybe a decoupling cap is going bad or something...

Its just constantly raining in Laraland 😀
I would add trying another monitor too. It does look like high frequency noise.

btw there definitely are Voodoo 1/2/3 diagrams somewhere, either original or reverse engineered, because people keep making reproduction cards.

drosse1meyer wrote on 2022-11-30, 01:39:

Have you tried the LCD auto adjust? Swapped VGA cable? Perhaps another monitor?

If so, maybe a decoupling cap is going bad or something...

Evwrything you mentioned was checked. Still the same noisy picture.

moulder wrote on 2022-11-30, 11:10:

Evwrything you mentioned was checked.

another monitor checked? preferably CRT
you can always put scope on the signals and see spectrogram

drosse1meyer wrote on 2022-11-30, 01:39:

Have you tried the LCD auto adjust? Swapped VGA cable? Perhaps another monitor?

If so, maybe a decoupling cap is going bad or something...

yep