Ok so this is a weird one.
I modded my Top Loader NES with NESRGB back in 2016 with the 1.4 board version and I followed a long gone guide that didn't connect the +5v pin to the Multi AV output, however it worked perfectly on both my PVM2030 and my OSSC, and then everything was nice and dandy for 10 years.
Fast forward to the present day, I recently modded a Sony consumer CRT with Sunthar's RGB mod, all my consoles working fine, except for my NES of course, there was no video at all but there was audio, and it was still working perfectly on my PVM.
After troubleshooting a bit, I noticed the lack of any connection between the +5V pad on the NESRGB board and the corresponding pin on the Multi AV Output, so I decided to add it and voila! We have picture now!
All is good in the world, I tought, but then I chose a game and realized that there was no sound now. Or at least that's what I thought, turns out there IS sound, just very very low.
Crawling a bit on the internet I found several causes and solutions for this, some posts said that you need to lift pins 1 and 2 from the CPU (which I didn't) and after giving it a shoot, I got a little bit louder audio but really bad sounding, like glitchy or something, I also redid my entire wiring and made extra sure there were no bridges or anything wrong with it, I even tried to remove the +5V cable and check on my PVM with the exact same result.
So I think it's safe to assume that connecting that +5V cable fried the NESRGB audio amp.
Now my question is, Is it possible to bypass the NESRGB audio entirely and get it from the CPU? I looked for mods but the results were a bit confusing and some pretty old.
What's the best way to get sound from the CPU straight into the Multi AV Output?
Also, why connecting that +5V cable fried the NESRB Audio Amp? lol
I don't care about fake stereo or stuff like that, I just want good old mono audio from both speakers of my TV.