Killing the buzz on the Super Nintendo's audio!

For the longest time, I've had issues with buzzing on my Super Nintendo's audio. Part of this was due to the AC adapter I was using on my SCART to component converter as well as the poor quality SCART cable I was using. I'm now using a different converter entirely and I've picked up an official Nintendo SCART cable and this had made things a lot better. However, I'm still getting some buzz on the audio, mostly when the image is bright. I've tried connecting a ground loop isolator to the audio of my SCART to component converter, but this made no difference. I use many other consoles on this setup, but none have the kind of audio buzz that my SNES has. The N64 has a little bit of buzz, but you can only hear it when the game is silent. My PlayStation is buzz free, as is my PS2.

It seems to me like the console itself has the issue. I was thinking about ways to fix it and I was thinking what about if I ran two separate wires from the audio to the AV port? Would lifting the audio away from the board prevent the buzz?

*EDIT* I found a discussion over here:
http://nfggames.com/forum2/index.php?topic=3645.0
One guy mentions you can fix the issue by "sticking 100uf 10v capacitors on the red, green, blue, and sync wires". One guy says he "pulled audio off of the apu instead of the multiav port" which sounds similar to what I'm thinking, but ideally I'd like to still use the AV port.

 

If you want to get totally rid of the buzz, you have to get the audio signal from the S-DSP or the APU as stated at the end of your link... You might also think about a digital audio output for your SNES using a CS8406: http://gamesx.com/wiki/doku.php?id=av:snes_sp_dif"

 

An optical mod seems like overkill the SNES I was thinking of just running the audio from the APU and soldering it to the audio contacts on the AV port and cutting the audio traces on the motherboard. This should bypass the mainboard and hopefully prevent the buzz.

Uh, which legs on the APU give left and right audio? I've found a bit of information on Google, but I can't seem to find anything that clearly points out which leg is left and which is right. Any tips? Also, I read that it's a good idea to put a resistor on the line to bring the voltage down to consumer levels, sound like a good idea?

 

The digital audio mod seems like an overkill but sounds great I love it!
However, I don't either know / didn't either found the pinout of the S-APU But if you are able to find a documentation, I would prefer lifting the pins instead of cutting traces on the mainboard. It's easier to undo if it doesn't work...