And we have video! The VGA output looks superb...though we don't have audio
Pads on the bottom side of the PCB are connected to the wii multi-out connector's through holes. It's a blind solder joint, as I had to push a fine tip iron through the holes and have the solder wick through to the pads. It worked phenomenally, without the need to reflow joints.
My dimensions were slightly off, because my paper PCBs were incorrectly sized due to my default page setup on KiCAD not being set to 8.5x11" paper. Luckily I was able to shorten the top edge with a file. Additionally, I added a cutout in front of the headphone jack. Unsure why I didn't position it further forward. Otherwise, no components interfered.
Anyone see what mistake I could've made with the audio?
I'm now working on a charge board using a BQ24133 & BQ76925. Currently digesting the datasheets and user guides front to back. I've also started to work on a replacement sensor bar using SMD LEDs. As soon as I build it and confirm it works, I can start figuring out how I should bend some sheet metal around the LCD.
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EDIT 9/19/2020
Perhaps this is not the solution, but I got some audio out. I noticed U7 has no power. The compendium tells me that's 12V. I severed its connection to the 12V power plane and connected 5V to U7's VCC pin. I got some massive static, but was able to make out the Melee background music. Moving the cable any amount unpredictably influences the sound.
Is the solution to pull Audio L and Audio R directly from the AVE (pin 39, pin 43 respectively?)
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EDIT 9/21/2020
Yes, audio must be pulled directly from the AVE or at least before the U7. To keep it clean, I removed U7 and bridged the corresponding signals.
The definitive trim guide has some young player's traps. The signal before U7 and after U7 are technically different signals as they're passed through the IC. The guide mentions that there "are multiple alternate points to connect audio and video to," while representing them with colors and numbers, but that does not mean its the same continuous signal.
Tl dr; connect audio at the AVE.