Tried to unplug and replug the connector, it was definitely dead.My LCD background light died after 2 months of use too. It has been replaced before for the same issue. I am tired of going back to the dealer for this kind of minor things. In your case, try to unplug-replug the LCD connector to see if comes back to life.
I plugged it in with my wife base Turbo and it her display worked fine, I then swapped my broken display for hers and it was dead on her bike.
My LBS got me a new unit under warranty.