The RCA Doesn't work right, i think it has something to do with the Jacks, when i push down in their general area the sound starts to work and one of the little tabs that the wire is connected to is loose. Does it matter if its loose or not? The other one isnt.

It is "that game boy".

if you've done it before why didn't you just use that game boy

The only camera i have is a DSI. But im pretty sure ive fixed it already.

What do you mean? Did the problem happen after you did this?

This is the interwebs.  Typos are legal.  I've seen much worse grammar/spelling issues than saying barley instead of barely.

barley is not an adverb.

You should show hi-res pictures of the circuit board.  Maybe someone can pick out the problem that way.

Its the same gameboy, i did switch the circuit board out with a cleaner one, the original board had solder all over it. When i say you could barley hear it, i mean that you can barley hear it, i know the norm for volume with, without prosound, and something is wrong.

You could have grabbed any Gameboy around.  You didn't have a second one or a friend with one laying around?  It didn't have to be prosound.  Prosound may give a slight volume boost and bass boost but it's not required.  Actually, I used to record all of my songs with a Gameboy Pocket without prosound and other than a little more hiss than normal, I thought they sounded fine.

Ok, first of all, ive done a prosound before and i know the level of volume it puts out. I just took all the solder off and re-did it with new wire. For the even i just used bgb and had a line connected to the speakers. It wasn't as glorious but it worked.

well i hope you learned why you don't half-mod a gameboy when you have an event coming up

are you using the same pair of headphones? some headphone drivers need a lot more gain to get a decent sound compared to others (this would be more apparent with a "quieter" signal, after all).

if you already had a prosound 1/8" jack (internal or external) then maybe the added RCA outputs are drawing more signal away from the headphone jack? idk how that shit works though lol. maybe post pics of your work so someone learned can see if you've goofed it up.