Well you were right Alan. It was the A/D converter. I didn't know what that was but i had a look at the board and found a removable chip besides the C1 chips that are for the type of board. I googled the number to see what the other chip was and it's an A/D converter so i swapped it out with the original bad board and all working fine again for now. I have ordered a couple of new ones.
Thanks again for your help