I was in the same position as the OP and I was beating my head against the wall trying to figure out why my screen had gone black. After MANY hours of testing, I determined that it was changing the baud rate to 250000! I don't know WHY this would react the way that it did, but, that's what happened. I just thought I would post for others to check that.
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RE: Ender 3 V2 black screen..