I have a circuit done that is giving me lots of dead PICs for some reason. The PICs program fine but when installed in the circuit they lose there functionality and I can no longer program them nor can I even read them. Even the target ID is set to 0000 as well as all the memory locations. I have not put code protect on either. Once this happens the chips become totally useless. Any one have any ideas? The PICs I'm using are the 16F628A and the 16F88. I thought there might be a problem with the F628A for I tried the F88 and the exact same problem.