Regarding the prosound mod again. I installed an RCA mod as well, and played with it for a while, until today. The gameboy now turns off by itself when there is sound. If I open up LSDJ and play a song, the gameboy will shutdown after like 5-10sec. But if I just leave it on without any sound playing, it never shuts down. What would cause that? A ground not wired properly? Or simply two wires touching each others when they arent supposed too? I'm asking because some of my wires seem too be a bit too close to each other, but I'm not sure what wire I'm supposed to  try to fix...

So basically I'm asking ,if the gameboy turns of by itself after a few second, would that absolutely be related to a ground issue  or something else?

Oh that's exactly it! I simply tried it quickly with my headphones to see if it worked. Didn't think about that but it makes so much sense now.

Thank you!

So I finally decided to start modding a DMG. I installed a prosound mod and the sound is much better, no noise, but it's really not as loud as the original one. I checked again the tutorials I followed and I seem to have done everything ok. I don't know much about this stuff but I thought it might be caused by bad soldering (since I'm not so good at that). Both left and right channels are working fine though so I guess all wires are connected, but the sound is so quiet.

It's a prosound mod from nonfinite electronics, installed with the wires they provided. So would that be caused by bad soldering? Bad wires? A problem with the prosound itself?