1) if your display use batteries ,replace by new ones.2)tight the flexible cord from keypanel vs display board3)tight the display board vs lower board( main motor board)4)see if your have 5VDC to display board coming from lower board.5) Test the lower board is coming the power 115 VCA + 5vdc COMING from power supply (transformer+ diodes+capacitor).6) Display board is faulty or Main Board(Lower board). Of course after you did check the step before. See the block diagram that I did for your illustration.

Sincerely. Good luck, G-d bless you.
ERNESTO CUADRAMANAGUA,NICARAGUA. C.A
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