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An option may be to manually flash the firmware using XHDMI tools: https://gitlab.com/chriz2600/xhdmi-tools/-/blob/master/README.md (let me know if you need help)

Have you checked continuity between those points on the chip and the DCDigital board? https://media.githubusercontent.com/media/chriz2600/DreamcastHDMI/master/assets/VideoDACSolderingPoints.png

I had an issue with a broken trace right after the resistor stray - using magnet wire to jump that trace from the resistor all the way to the DCDigital PCB fixed my audio issues.

Hmm, have you tried something like post #9 from here: https://forums.black-dog.tech/index.php?threads/no-audio.117/

Could you take a more zoomed in pic of what’s happening at the audio DAC? It’s a little hard to see how all those wires are soldered. I notice you’re using the audio flex in tandem? Sometimes those lose continuity when pressure, such as folding, is applied to them.

I always use Kapton tape to firmly secure the flex cable against the GPU; the sticky piece of tape comes loose very easily.

I would still reflow IC701 since it's both involved in sound and the key component of the XStation installation. Also, Dan and Chrisof are a lot more active on Discord than on here, as are more people generally: https://discord.gg/wrHgE3wk

No audio can be caused by legs on IC701 no longer making a connection, possibly lifted a little by accident when installing the XStation. I would try to reflow IC701. Doing the same with IC310, the sound RAM, wouldn’t hurt either.

You can just look at what the pin arrangement on the audio flex cable is: Pin 2 of the chip = Pin 1 on flex end = pin 1 on board Pin 3 of the chip = Pin 2 on flex end = pin 2 on board etc...

Yeah, all four vias are 5v.

No worries at all, none of this is exactly intuitive and unless you had prior exposure, it's certainly challenging to piece together from scratch. Once you solder the wires 1-5 to the little board and plug the cable in, you can place the board essentially anywhere on the motherboard where...

The colored locations are simply the path along which the signals coming from the audio chip travel along to their final destination. Where that is is irrelevant to us in this case since what we want to do is "capture" those signals as they're traveling and route them to the PS1Digital, and that...

And that was the only chip you had reflowed? Does anything happen when you press down on the bios with your fingers as you power on the console? I’ve had black screens be caused by RAM/BIOS/CPU/GPU needing to be reflowed, so pressing down on each one at a time at booting up may help to narrow...

Did you apply fresh solder and flux or just reheated the old solder?

Are you getting any analog or digital audio during the black screen?

The Dreamcast's dithering is hidden well by analog displays, and is merely made obvious by the DCDigital's crystal clear video output. Totally normal.

Can you show us a photo of your soldering? A nice reflow almost always fixes the double image problem.

480p can't be linedoubled - you would be getting 960p otherwise, which is far beyond what the WiiDual is capable of. Therefore, that setting is always disabled for 480p.

Did you test the console after installing the XStation first to verify that part is working correctly? The GPU pictures unfortunately are a bit too blurry to assess if all the legs are still making connections with their respective traces. Could you try to take one that's a bit more in focus...

So you just need to make sure there’s continuity across the fuses. This is an example photo, but that’s what they look like - labeled 15, 20, or 50. They’ll be on the bottom side of the board, left-mid side.