Black Screen of death?

So, I was using my Mini 6 and I leave to return to it 1hr later and nothing I get like 2 frames of a red apple logo then nothing. It is still on running IOS in the background plugging in an external monitor confirms that. Tried a new screen didn't fix it tried soaking connectors in 70% ISO alcohol that didn't work, tried DFU, Factory restore thru iTunes nothing. What else can I try. I am so confused that this happened out of the blue.