Hi. I have a tac 20 PI in lobby that was dead. There is a PI in car and lobby .. car PI is working fine . After reset on the board it came back on but the pixels were messed up. You could barley read floors but it was stepping correctly with correct floor denotations. This PI has 2 boards attached to each other. A main cpu board and then the display board. Can I just replace the display board for this problem ? Is the main CPU board a plug n play ?