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Are you keeping your iron tinned? I'm just speculating without actually seeing you work, but if the iron isn't tinned and it isn't reacting quickly enough, you could be putting a lot of extra heat into the CPU, that could potentially do this.

Speculation is relevant here though, as I've seen and heard a lot of broken game boys, and this is a new symptom to me. Maybe nitro or rolf or someone has input to offer.

What are you using to de-solder? I prefer those little solder-sucker things for this type of work.

From the side with the white wire, they are switch normal, ground, right output, left output.

from http://lowgain-audio.com/GBclassicmod.htm - probably also helpful to you

Signal is already headphone-amped at that point though.

Regardless, I disagree with your assertion that the pitch mod works. If these weird glitchy sound things only happen when the pitch mod is on, then clearly something is wrong with the pitch mod.

There's a couple problems with what you've got going on at the moment.  For one, the half-speed crystal is entirely dependent on the getlofi board - you would never be able to half clock without engaging the variable clock circuit.

Second, you have the two chips in parallel. I regret ever using that word in this thread.
However you install the half-clock, the switch needs to be able to select between the two crystals. This will involve desoldering at least half of the existig crystal.

from here: http://gieskes.nl/underclocking_or_over … _tutorial/ which will probably be helpful.

As for the speed pot not working, I recently transferred a getlofi modded game boy into a new case, and it had that symptom, but it turned out to be that the ground wire had become disconnected. I would check your solder joints.

Installing the two mods separately is a lot simpler - you install the half-clock mod normally, so you have a witch that selects between crystals, then you install the get lofi mod, which will control the speed of whichever crystal is selected. ta da

Sorry, that was a terrible explanation. I'm pretty sure the getlofi kit starves (or force feeds) your crystal of voltage to change its speed, so there's no crystals running in parallel business per se.

The important (read: correct) part of what I was saying, is that you can do the half-clock mod and the variable speed mod completely independently and be sure they will both work, with the fun bonus of discovering what happens when you turn them both on, which is an unknown to my knowledge.

I'm assuming it might go a little slower, but will crash about halfway down.

whatcha gon' do wit it?