Update time: the pieces to built the internal part of my power supply have arrived. I wired up my 5v2a usb C board to my 5v-12v1.2a converter. I’ve confirmed that it is able to give me enough voltage to power my Wii (11.66v), but I’m doubtful that it can supply enough amps. When I hooked everything up, the Wii refused to boot even though everything had been fine when it was running of my bench power supply. I’ve run a few more tests, and confirmed that the step up converter is simply causing the Wii to draw more amps than it can supply. I have one more idea to try, but I wanted to run it by you all first in case it poses a risk of frying my Wii. Would I be able to wire both the PSU and my 5v-12v step up converter to my usb C board at the same time, than wire the converter to the 12v (VIN) wire connected to the audio amp and the sensor bar thing with the positive line and then wire it’s ground to some ground on the mobo?
View attachment 30930
(This wiring is just for demonstration purposes. I haven’t given anything power yet)