Title says it all. I bought an Ardupilot board back in 2012. V2.4.1 is printed on the board. I have not found any schematics for the board anywhere on the internet.
The yaw input is not working (IN4). IN5 and IN6 don't work either but all the others do. I'm wanting to check continuity between IN4 and the AMTEL chip to see if there is anything to be fixed. My last resort is attempting to solder in a new chip.