Recovering non-responsive buttons on 42S

[GreyUser]

It is the most common problem on that series of machines, The foam pressure pad that holds the keyboard connection against the processor board has lost its spring force and lost contact. The foam degrades over time, becomes gooey and looses its ability to maintain the force required. The unit needs to be opened, the board popped off and the pad replaced and then reassembled.

Spaying solvents into/onto the unit is not a good idea, it can attack the plastic of the keyboard and do some irreparable damage to the small pieces of ABS that hold the keys in place. Once they break, it is game over.

The repair is documented here on this website/forum many times.