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Sounds like the bug in the DMG's CPU. What board revision is your DMG? DMG-02/03? Will say on the bottom of the back of the motherboard, visible through the battery compartment.

It's been explained several times in this thread, but maybe a photo reference will help.

This is typically how the pro sound mod is done. You can alternatively add a DPDT switch to make the headphone jack toggle between prosound and the amplified output.

For how simple and effective the prosound mod is, it becomes impractical and unnecessary to recreate the amp circuit. It's been done, but I don't think the primary intention was to remove noise.

If the problem is the soldering, simply adding more solder could potentially offer a permanent fix. I have some tools to diagnose which address line the cartridges are failing at if a visual inspection isn't enough.

If you have an external cartridge programmer, I'd also check to verify that it isn't the programmer circuit that failed in the bleepbloop.

If you'd like me to have a look, I'd be happy to diagnose the issues at no charge.

Can I see a picture of how you're wiring this? I don't know exactly what you're circuit bending, but there should be a regulated power source, and you should be soldering the LED to that with the appropriate resistor. Keep in mind that a single LED with the incorrect value resistor is capable of drawing enough power to cause things like audio failure, or worse.

The email you used for your order can not accept incoming mail. Your order was shipped with the second wave and is still in transit. If you reach out with a valid email, I'll send over your tracking info.

Yes - It could be the white ribbon cable that connects the two boards, the brown ribbon cable under the LCD, or possibly a broken contrast wheel. You can try pouring a bit of rubbing alcohol into the contrast wheel and turning it rapidly to see if it fixes the issue, but it is most likely the ribbon cables.