Question Ashida Speakers Not Working

[dkabot]

Might end up transforming this into an incredibly late worklog if more comes up, but for the moment there’s just the one major issue.

For the longest time (~3 years) of having this Ashida project going, we (@kgal104 and I) would get speaker audio perfectly fine, and headphone switching would work only if HS was connected to the Wii (this being despite having a U-AMP 2 and not an RVL-AMP). Without it, while audio wouldn’t switch, the volume wheel would stop responding on the speakers with headphones connected.
As of a few days ago, this has gotten weirder.
HS is still necessary for the headphones to receive audio, but the speakers aren’t getting any audio under any circumstances.

We tested with an oscilloscope, and found that the speaker wires simply didn’t have any audio coming through them, while the headphone wires (right channel was tested) did even if no headphones were connected (but HS was). Interestingly, we saw similar volume wheel behavior; it only adjusted the levels we were reading when headphones were plugged in.

I’ve attached images of the general wiring, U-AMP wiring, and the oscilloscope checks. The consistent pattern is what we get out of the speaker wires (< 1V), whether the Wii is on or off. The other two are sound data from the right headphone channel, with headphones plugged in and unplugged.

This may well be the last hurdle before things are all clear, but we’re completely out of ideas here.
I’m hoping not to have to acquire _another_ U-AMP 2 for troubleshooting, but can’t think of any other component it could really be.

Is there anything else that might be worth checking?

 

[cy]

Have you verified that the speakers are making proper contact with the controller boards? I had to manually hand wire mine since mine weren't. To that end, have you also tried wiring directly to the speakers?

 

[dkabot]

Have you verified that the speakers are making proper contact with the controller boards? I had to manually hand wire mine since mine weren't. To that end, have you also tried wiring directly to the speakers?

Manual wiring has not been attempted, but checking with a multimeter on the boards shows continuity while the speakers are present and none when they aren’t. Between this and the oscilloscope check for the speakers using wires directly off the U-AMP, I believe that the speaker connection is not of issue.

 

[dkabot]

Significant update:
Whilst doing unrelated arbitrary looking, got noise out of the speakers that escalated into a split second of game audio before reverting to silence.
Unfortunately it appears I cannot attach a video like I can an image, so I've uploaded the clip to YouTube; hopefully that's a sufficient compromise.


Further update so I don’t triple post:
The audio channels on the headphones feel very incorrect. Everything is there, but there’s a major bias towards the right side. I can’t strictly confirm this on other hardware right now, but this definitely isn’t the case on e.g. Dolphin. Maybe the U-AMP 2 is busted, somehow? @kgal104 says it’s unlikely to be the Wii itself due to the i2s sound stream that the amp processes being intact.