ultrageranium wrote:friendofmegaman wrote:Apart from the aforementioned points I also replaced a cap on the power regulator with new (and bigger) one and replaced both caps on the phone jack PCB. And I have no hum at all.
I will probably do this mod in a near future, would you mind telling which cap did you replace and with which value?
Also, does this hum issue concerns only the regular mini jack output or also Pro mod sound output as well?
Thanks!
Values are the same as native (they're written on the caps) I replaced them just in case. I'm not sure about pro sound since this was a gaming gameboy.
If you want to avoid hum I suggest using this approach http://chipmusic.org/forums/topic/6031/ … -mount-ic/
In one of my other projects I used DIP inverter, but managed to allocate it right above the LCD jack and in such position there's no hum at all. If you're using ThursdayCustoms's biversion kit you're fine as well 
The hum appears when your inverter is somewhere in the region of GB processor on the link port half of the board. That's what trial and error shows.