Korg Poly800/EX800 Users

i dont have any display problems of any kind and i opened it up to 
find DUST Bunnies.......arrgghh!!
but when i hammer on a key long enough i can here the faint sound of 
a generated tone...not prog 11 though it is dead in the water and the 
vco works i can here the light tone being modulated.. keyboard 
membranes were cleaned of debris and double checked for good 
connections.
thanx for all you response...the poly lover.jeff