exactly what necr said, i swear i have seen an error message exactly like that in one of the first and shorter console outputs that you have shown.
The reason for that is most likely an issue with one or more voltage rails.
To reiterate, Stuff does not just take 12v from the PSU.
SOCs, CPUs, GPUs take a lot of different voltages.
Most common are: 5V and 3.3V with Stand-By variants that are always on, so that the thing can ron on something low poer and then detect the power-button and turn on.
And 1.5V or 1.2V for DDR variants,
1V Vcore for the actual Switch "core"
And possibly other Perifery stuff, 1.8V PLL, what ever.
Many different voltages.
AS far as i could read the labels in your pictures / videos beside the green LEDs, for example with the blinking one that is not readable to me,
it looks like that is indicating the main 12V rail being wonky and since everything else gets created from there, nothing worked.
In later videos and pictures, still not readable to me, shoddy stuff honestly, it looks like you are still missing some of those needed voltages.
I can't tell you exactly which and how many because i don't have such a switch anymore and i can't honestly read and see stuff in anything you showed us so far.
My best bet currently is that you had a dead cap short the main 12v rail which caused that wonkyness, prolonged torture of that cap then blew that one up that its not shorting anymore and not you have a second issue of possibly VCORE not turning on and hence keeping the switch chip off.
excuse the rambly style, but i'm frustrated with your lack of cooperation so far.
The reason for that is most likely an issue with one or more voltage rails.
To reiterate, Stuff does not just take 12v from the PSU.
SOCs, CPUs, GPUs take a lot of different voltages.
Most common are: 5V and 3.3V with Stand-By variants that are always on, so that the thing can ron on something low poer and then detect the power-button and turn on.
And 1.5V or 1.2V for DDR variants,
1V Vcore for the actual Switch "core"
And possibly other Perifery stuff, 1.8V PLL, what ever.
Many different voltages.
AS far as i could read the labels in your pictures / videos beside the green LEDs, for example with the blinking one that is not readable to me,
it looks like that is indicating the main 12V rail being wonky and since everything else gets created from there, nothing worked.
In later videos and pictures, still not readable to me, shoddy stuff honestly, it looks like you are still missing some of those needed voltages.
I can't tell you exactly which and how many because i don't have such a switch anymore and i can't honestly read and see stuff in anything you showed us so far.
My best bet currently is that you had a dead cap short the main 12v rail which caused that wonkyness, prolonged torture of that cap then blew that one up that its not shorting anymore and not you have a second issue of possibly VCORE not turning on and hence keeping the switch chip off.
excuse the rambly style, but i'm frustrated with your lack of cooperation so far.