Used this AOG system last spring, worked fine. This fall I plugged the tablet back in, and I have ethernet communication, but no GPS, WAS, or Auto Steer. I re-flashed the teensy, checked that I had proper voltage at several placed on the board, and I have proper WAS voltage at the multi pin connector.
Here is a picture of the board
Looks like it is not completely setup. Check out the AOG train ing video playlist. https://www.youtube.com/playlist?list=PL1N2N2XFHWW1fIDhb7koOa7hxH0LGppYc
This is a very old video - use the first-run video in playlist as Chris suggests.