- Posts: 292
- Joined: Wed Feb 20, 2019 5:23 am
- Location: Canada
- Real Name: Rick Welin
VioletWolf wrote:No worries.
Yes I tried isolators and all sorts of things before I finally, after months, got frustrated and cut the plug. Nothing else worked.
For background I've been building and operating professional recording studios for most of my life so troubleshooting hums is second nature. This one was weird. My computer guru had never heard of such a thing and, in the end, we guessed it was related to something miss-wired in the computers power supply.
I've had it happen on 2-3 computer builds over about 10 years.
This case is an old one, but it's new to me as my son's friend had it laying around and wanted to get rid of it. I planned on giving my brother my old PC, so I figured I'd use the case and then I wouldn't have to buy a new one. I didn't think about how the lack of proper bonding might become a source of noise. No PC I've ever built has had audio noise. It's not even very loud, it's just above being audible when the CPU fan is running at low speed and I'm adjusting a control in Resolve 16. I don't hear the noise in any other application, just Resolve 16. I didn't even hear it in Resolve 15. I think the other poster that mentioned current flows into the GPU is probably right since I'm using the scopes on the color view and Resolve 16 is now powering those scopes with the GPU, whereas Resolve 15 wasn't, so the noise issue is starting to make sense to me now, but I'll try the ungrounded outlet adapter too. After all, I already have it and it's only a few seconds of my time to try it, so there's little reason not to, but I will bond that mobo panel before I try to unground the power supply cord. I have to make sure all metal case surfaces are electrically connected together before ungrounding from the outlet.