I think I can also say with confidence that it's not a software issue since - again - the headphone jack works. I'm using the TinkerBOY Retropie image from https://www.tinkerboy.xyz/retropie-sdca ... r-support/ if that matters.
The wiring seems pretty straight forward and my solder joints look good...and I've verified everything with a multimeter so I don't think it's wiring. But I'm attaching some pictures for review. If anybody needs any other pictures, of course just let me know!
What I've tried:
- I've de-soldered / re-soldered everything
- I tried wiring the speaker to the "SR-" and SR+" pads instead of the "SL+" and "SL-" pads on the TinkerBOY. No change.
- I've swapped multiple power supplies, including a known good 5V. 2.5A power supply.
- I've used two different speakers, so I know it's not the speaker.