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Author Topic: Video Noise on any monitor connected to PC  (Read 522 times)

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nipsmg

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Video Noise on any monitor connected to PC
« on: December 04, 2018, 08:45:52 am »
I recently modded a TV set for RGB and am connecting to it using a video card and crt_emudriver.  Yesterday I noticed some pretty severe noise and wavy lines on the picture.  I had initially figured it was due to unshielded wiring used to mod the TV, and maybe the flyback was causing some issues.   So I plugged an LCD monitor into the integrated graphics (separate video card) and saw the same exact pattern.   The pattern persists on the LCD attached to integrated VGA when I completely disconnect the CRT.

Any idea what would cause that?

I took a video.  You can see the noise somewhat, but it is much more pronounced in person.




Suggestions?


buttersoft

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Re: Video Noise on any monitor connected to PC
« Reply #1 on: December 04, 2018, 07:15:06 pm »
Assuming we're not looking at what appear to be physical marks on the screen above and to the left of the windows logo in your vid...

I would guess at interference, and if the CRT is not only disconnected but powered down, it'll be power related. Do you have another powersupply you can try? Even a cheap, low powered one would be fine to try with your GPU unplugged.

big10p

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Re: Video Noise on any monitor connected to PC
« Reply #2 on: December 05, 2018, 07:49:01 am »
Can't really see anything in the vid. Almost certainly power related or a ground loop. Need to know more about exactly what your setup is.

nipsmg

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Re: Video Noise on any monitor connected to PC
« Reply #3 on: December 05, 2018, 09:57:10 am »
I'm 90% sure it's bad PSU.  I'm able to alter and even elminate the noise by manipulating the cables coming out of the PSU. There's something bad happening there.   Just ordered a new modular PSU (and some new VGA cables to be on the safe side), both will be here tomorrow.

nipsmg

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Re: Video Noise on any monitor connected to PC
« Reply #4 on: December 11, 2018, 05:12:45 am »
Quick update:

Confirmed.  Bad PSU.  Replaced with new PSU, picture clean and stable.