on my 94 Aerostar the display on the radio all of a sudden when blank and won't come on. The radio and tape play just fine... just can't see what station we're on or what band (AM/FM) we're using. Anybody know if there is a fix to this without replacing the whole system?

Easiest is to check ebay, some of the people on the list, etc for a whole radio and swap it. Seen all sorts of them go on ebay for $5 to $15 just watch for the sellers that hide their profits in the shipping ripoffs.   Which radio do you have, the one with the rotary volume knob in the lower left or the one with all buttons. You will need a set of DIN radio removal tools (Auto Zone for $4 or $5, Walmart, etc) to pull it after you drop the apron under the column then the bezel around the radio/ashtray/etc.