I cannot open the top consol and buttons dont work, screws are stuck in and just spin without coming out
1) Try to open the top consol.
2) Spray with contact cleaner( from radio schack or computer store)
3) Tight the flexible cable from keypanel vs display board
4) Tight the connector from display board to Lower board( Main Controller Board)
5) Test the main controller board.
6) Test the transformer.
Finally See the Block diagram that I did, you will see how the Main Controller Board has the 90% in any control. In that way you will have a good Strenght resultante, for to determine who is faulty. sincerely. Good luck.
E.CUADRA
MANAGUA, NICARAGUA. C.A
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