TRY RUBBING A LEMON ON THE CONNECTING MEDAL LIKE WHERE A CORLESS PHONE OR PHONE BATTERY HAS THERE MEDAL CONECCTIONS AND CLEAN IT WELL IF NOT NEW FACEPLATE OR BAD BRAIN HEADUNIT'S DO GO UP MAWYBE INTERNAL FUSE WHICH IF YOU REPLACE IT ONCE AND IT DOES IT AGIAN DEAD HEAD
If this is a "flip face" type of display then you may have a broken lead in the ribbon cable that connects to the main board from the flip face. This is a very common problem. You'll need to replace that ribbon cable.
Display OK lcd display is faded out. This is normal with time
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