I believe I've found out the issue. I think it's the left channel on the pcb itself that doesn't work, because when I connect the left and right together to make it mono, both the built in headphone AND the prosound work, but only in right mono-- if I set anything to play just in the left ear it won't play. I think the only solution is to start new with a new DMG, thanks for all your help, everyone, I guess it wasn't the prosound after all ^^;
1 Feb 5, 2016 9:44 pm
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
2 Feb 5, 2016 1:46 pm
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
Apeshit wrote:
You've removed all wires, and cleaned up the solder joints and you're still having issues?
FYI: headphones with extra terminals on the connector can be finicky. I realized my apple headphones will short out the headphone jack if they're inserted all the way.
Yeah, I've actually done that twice now-- and I've replaced the wires entirely and it's still having the same issues ^^;;
I've tested it with multiple headphones and basically no matter what I do I only get sound in one ear 
3 Feb 5, 2016 2:15 am
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
I've completely resoldered the prosound module again, and it still is having the same issues. By now I really think it's the prosound unit, unfortunately I don't have the original packaging anymore so I'm just going to buy a new one and hope it comes in time
4 Feb 5, 2016 1:42 am
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
I removed the prosound mod and the built in audio port still didn't work correctly, I think it might be unrelated?
5 Feb 2, 2016 11:51 pm
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
I should add some important information, I goofed and said in the OP that I'm using a 1/4" prosound kit-- sorry about that. I'm actually using the 1/8" prosound kit, I have no idea why I wrote 1/4", apologies!
6 Feb 2, 2016 10:32 pm
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
kineticturtle wrote:
The quality of your soldering looks okay, but there's too much wire exposed at the contact points; it looks like you kept the iron on there a little too long and the coating on the wire melted off. It probably works fine when the gameboy is disassembled but when you close it it may be pressing the wire against some other contact and introducing a constant voltage into the signal which you're hearing as hum.
Basically you need to undo the solder joints, cut the exposed part of the wire down shorter, and redo the solder joints faster - it might help to apply the iron to the contact on the board, then as soon as the solder flows, apply the wire, then remove the iron. This should all take no more than a second or two for each joint, all told. You might find some junk electronics to practice on first before attempting this again!
Good luck!
I can try this-- but I've been testing the pro sound jack while the case is open and while it's closed-- and in both cases I still encounter the issue of only getting sound in one ear.
jefftheworld wrote:
2PLAYER wrote:What cable are you plugging into the jack? The issue sounds a lot like plugging a mono 1/4" into a stereo jack.
The modification is affecting the built-in jack as well, which means it's almost certainly an issue of bridged points.
From the picture, do you think it's the ground point that's been bridged? It looked fine to me, but I'm very new to soldering ^^;
I've been testing both jacks with audiotechnica ATH-M50 stereo headphones and cvs brand cheap earbuds, both are 3.5mm
7 Feb 2, 2016 9:30 pm
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
Here's a quick picture of the pcb I took (the 5 audio solder points), it doesn't look like anything's bridged as far as I can tell-- I don't have access to an ohmmeter yet but I'll try that as soon as I can
8 Feb 2, 2016 8:56 pm
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
urbster1 wrote:
I wish I could offer some help, but my big question is, if both the built-in headphone jack and the pro-sound jack aren't working properly, what makes you believe that it's only the pro-sound unit that's faulty? Would that be the only cause of all the issues you are having? I'm asking genuinely because I haven't done a pro sound mod, so I couldn't tell you.
If worse comes to worst, maybe just order a 1/4" TRS female jack and wire/stereo cable from Amazon? Not as elegant, but it would be more timely.
My reasoning is that the built in audio jack is having audio channel issues independent of the wiring of the prosound. It's possible that I'm incorrect in this, but I switched the left and right wires for the prosound, and that switched the side that worked for the prosound jack (IE it was right only before, and once I switched it, it became left only), but the built-in audio jack is right-only regardless of the prosound's wiring, which suggests to me it is an independent issue. I'm sort of new to this, but since the built in audio jack is having a consistent issue, and the prosound jack's audio issues change depending on the wire, I think they're separate, anyway.
9 Feb 2, 2016 7:59 pm
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
Hey guys, at this point I think I've determined that the issue is with the kitsch-bent store prosound 1/4" unit. Does anyone know if the kitsch-bent store does returns? The unit itself is not that expensive so the price isn't a huge deal, but I'm going to MAGfest in two weeks and I'm worried about the shipping time for a new unit-- I can compose music using LSDJ using the left earbud or the speaker, but obviously that can't work for live sound or recording if I only have access to one channel, and also I can't do any panning or anything.
10 Feb 1, 2016 7:39 pm
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
Update: I switched the connections so that the (what I assume to be) left channel on the prosound unit is connected to the right connection on the pcb and (What I assume to be) the right channel on the prosound unit is connected to the left connection on the pcb. Put everything together and tested it, now the left ear works and the right ear doesn't (before the right ear worked and the left ear didn't).
So originally, left on prosound is connected to left on pcb, right on prosound is connected to right on pcb: Right sound works, left does not.
Now, left on prosound connected to right on pcb, right on prosound is connected to left on pcb: left sound works, right does not.
Because of this, I'm working under the assumption that the left prong connection on the pro sound unit is not functioning. I don't have access to a multimeter at the moment, so I can't exactly test my theory, but given the evidence I think that the pro sound unit itself's left prong is having issues. I can also hear the sound VERY faintly through the speaker when headphones are plugged into the pro sound unit.
If I hold the headphone jack at a certain angle, the sound goes through the speaker at full volume, the left earbud at full volume, and the right earbud VERY faintly.
Regardless of wiring, built in audio jack is wonky, which means to me that the built in audio is unrelated to the issues with the prosound.
Does anyone have any suggestions of what to do at this point?
11 Feb 1, 2016 4:57 am
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
Okay, replaced and resoldered the connections from the pro sound to the pcb. Still only getting audio on the pro sound from one ear-- the only thing I could think of is maybe I just confused the pins on the actual pro sound unit? There are 3 prongs, one longer one on the bottom which I assumed was ground, and one on the left and right. It's possible its not like that at all, and maybe that's why I'm only getting audio in one ear? I'm not sure because if I fenagle the headphone jack around, I can hear both ears for a tiny split second, but then it goes away again.
12 Feb 1, 2016 1:56 am
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
Okay, so I've checked my solder points and resoldered the left ear connection (the one that was not playing sound), and it still only plays sound through the right earbud, on both the prosound jack and the built in headphone jack. I'm gonna try just resoldering the entire thing, just for completeness sake. Because the built in audio jack is having problems with the left ear sound as well as the prosound jack, that leads me to believe it's not the prosound unit failing. I'm gonna try to resolder it entirely but as far as I can tell the solders are okay o.0
13 Jan 30, 2016 8:51 pm
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
catskull wrote:
darthnumbers wrote:Ahh, gotcha. I'm a little confused by the weird change in buzz I get when I press A or Start in LSDJ (it happens when actually selecting notes, but not during playback), and it plays through the speakers, so there's feedback through the speakers related to my input, even when the sound is off.
Gotcha, I'll have another look at the soldering-- the pro sound definitely works, the ear I can hear through has great sound quality! I just gotta fix the connections.
Yeah there's something to do with a power saving feature implemented in LSDJ that causes that. When playback starts, that feature is turned off and it should not buzz when you press buttons. Someone correct me if I'm wrong, but you're still well within the limits of normal. I mean a gameboy was designed to play tetris for a 10 year old with crappy headphones so the audio isn't perfect. You'll likely want to do some noise reduction in post-processing.
Oh, phew! I was worried I had done something wrong (other than the soldering haha). Awesome, thanks for assuaging my fears 
When I have access to a soldering iron again I'll recheck my connections and such. I don't really understand how the DMG is wired-- would it make sense for faulty solders on a prosound to mess with the built in audio jack?
14 Jan 30, 2016 8:37 pm
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
The wires I'm using are the ones that came with the pro sound mod from the kitsch bent store, its a green wire, a blue wire, and a yellow wire I believe. Do the colors of the wires matter? Or is it just where they're soldered on to? I'm red-green colorblind, which is potentially a problem if the wires have to be color coded ^^;
15 Jan 30, 2016 8:25 pm
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
catskull wrote:
Pretty much a gameboy will always buzz a little bit. I don't think what you're describing is anything out of the ordinary. As for the left/right audio issue, yeah you probably botched the soldering. I'd be shocked if you broke the jack though. Grab a multimeter and check for continuity.
Ahh, gotcha. I'm a little confused by the weird change in buzz I get when I press A or Start in LSDJ (it happens when actually selecting notes, but not during playback), and it plays through the speakers, so there's feedback through the speakers related to my input, even when the sound is off.
Gotcha, I'll have another look at the soldering-- the pro sound definitely works, the ear I can hear through has great sound quality! I just gotta fix the connections.
16 Jan 30, 2016 7:50 pm
Re: Prosound question-- speaker and audio hum (29 replies, posted in Nintendo Handhelds)
Just as a note, I think I definitely messed something up in the soldering because when I set the output of LSDJ to just the left channel, I get no audio. Right and stereo both work (but stereo is just right in this case I think).
Also in LSDJ, when holding down certain buttons, for as long as the button is held down there is a louder and slightly higher pitched hum.