From my experience this is almost always a display problem. The display shown in your picture is the worst one which has ever been produced from my experience. The problem wasn´t caused by Riehl, these are the 7 segment dies themselves. They have a very bad ground connection, I have dozens of them with the same defects.
I´ve wirebonded a few just to be sure of the die to board connection but could never bring them back into fully working condition.
Moreover you could have a problem with the wirebond on the uP or a short on the uP itself. But this is very unlikely and wouldn´t change anything, right?
What you need is a good display and someone who will do the swap.