My new 33 year old ProChrony crapped out last month too. Same thing, display is gone. Someone has the new display on eBay but I couldn’t figure out how to get in the old unit. I did find a used unit for $50 so I purchased that and I’m back in business.
Now I’m looking for the chorded remote so I don’t have to get up and go look at it for every shot. The Bluetooth would be nice too but my pocket book wasn’t that ambitious.