Any Vega 64 Graphics Card Circuitry Guru's out there?

I obviously don't have the card in front of me to confirm this, but I would assume the LED comes on when the core VRM is in the normal run state. I doubt it has anything to do with the GPU (the actual GPU, not the imprecise and incorrect usage referring to the whole card) being "active."

You could try plugging the card in to a system with another functioning card, and see if it's detected as anything, but you most likely have a bad GPU die or interposer, which isn't something you're likely to be able to fix if you need to ask for help with this here.
 
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