I posted on here possibly over a year ago, but unfortunately I can't find my old post to resurrect it. Basically I was attempting to fix an 'S' key on the Apple II Plus which was giving no output at all and in the process of doing that I plugged the keyboard back into the motherboard with the ribbon cable upside down most likely frying something. I was told by some that it was the daughter encoder board that needed to be fixed or replaced. Some keys give their correct output, and then many other keys either don't give an output or the wrong output. For instance the letter 'I' would work, and it would also come out from a different key. I had swapped the encoder board twice to no success. I believe it's an issue on the motherboard now. Does anyone have any idea how I can tackle this?