Backlighting problems are very common in these radios. If you no longer have anything on your display, you didn't reassemble something correctly. It'* also possible, because there are static sensitive electronics on these boards, that you may have damaged something by incorrect handling (although this isn't as common as re-assembly problems).
Did you remove the LCD display from the board? There are 5 metal tabs that hold it to the circuit board and it'* imperative that it be reinstalled correctly. There are three bulbs, only accessible by removing the LCD display, that are prone to burning out. The other lamps on the board fail commonly as well.
Have a look here...
the radio light fix 00+