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Try a different display and if the problem persists, RMA the unit.
Sooooooo. About that. m(
Yepp. Different room, using my computer monitor everything is perfectly fine. No noise whatsoever. Super crisp picture. Couldn’t be happier. Captured everything here:
I assume there’s something generating that noise in the power line in the room with the TV. I’ll take everything off so that only the TV and the SNES with OSSC is connected and put everything back online piece by piece to figure out where the culprit is.
Thanks a lot for the help! As obvious as it is in hindsight, I wouldn’t have figured that out alone.
EDIT: turns out the culprit was the USB-C power supply for the Raspberry Pi 4 I got with the new TV for 4K videos. Problem solved.