I have changed both the CIA A and CIA B chips on the motherboard - I swapped the chips from my working 500 with the chips from the 500 plus. The chips I thought were damaged are fully working. But the disk drive is still not functioning properly (I can hear the sound of the drive motor).
*update*
I have noticed the battery has leaked (pic1), the gary socket has been affected (pic2), as you can see there is green residue in the socket when I lift the chip out. Any ideas on how to fix this or should I look for another motherboard?
pic1.
pic2.