Known good switch lite stopped working after testing repair parts

Hi there,

I have 2 switch lites that I purchased off ebay knowing they were broken, to refurbish. The first one I fixed no problem, just needed new sticks, so I decided to keep it as my personal switch. I was able to play on it for about a month, had zero issues with it.

Then the 2nd switch lite came along, when I opened it up, there's some minor water damage, indicators are red, a couple scorched pins here and there, so in an effort to see if there was anything seriously damaged on the motherboard, I swapped that one for the board in my switch.

I didn't have much luck, so I returned the motherboards to their homes, but now, my switch doesn't power on. It pulls 1.30 amps, the charge port is solid, all the connections are good but still no life out of it. I suspect the WD motherboard might have fried the LCD but is there anything I can look for or do to diagnose further and see if it's board level damage?