I think there's one thing left to try. Try and run it anyway.
I was going to say the same thing but to be honest if one of those ASICs have gone wrong internally, you might as well not trust the entire chip anymore. It would be riddled with massively dropped internal voltages and the whole thing would be going bananas inside.
It was a bit gutting to see all those other devices heat up when the 3.3V rail went down. I think I saw that IR camera peak one of them to just over 100 degrees at one point
Another problem could be that the drop on the 3.3V rail as soon as it hits the board and spreads out is bad enough to stop things working all together.
Maybe put it back together and set the voltage so that it's 3.3v at the connector. Might just have some life left in it.