R Kannan wrote in
:

I tried cleaning the circuitboard and shorting the two interweaving
patterns (using a metallic contact) of some of the buttons but it did
not produce the effect of pushing the buttons. Does that mean the
circuitboard is defective and so irreparable? I want to make sure that
the circuitboard works fine before I try replacing the rubber buttons
with pushbutton switches.

Thanks


Is this circuitboard separate from the control board, or all on one board?
Does it seem you could tack on some wires to just try?