Quoted from oilspot:
Reseat the display connectors on top of the mpu. If that makes it flicker or come back on, time to repin and reflow some headers.mine had the exact same issue.
I'd start here if you still have an original board. That's what was recommended to me.
I had some light flickering and my second digit for the ball in play was off during a game. I turned off my Firepower for an hour and when I turned it back up it's working again.