How do you know if your ribbon cable is burned out?
If it looks a bit smokey on the ribbon itself then this is common,
its not burned out just a bit stained with age!
If you have no response from your keypad then this normally caused through a faulty or old battery , simply replace it with a new one , but first make sure you disconnect ALL power from your panel because the panel will still think its your old battery installed!
jc
June 2008