Go in to the configuration pages and find the transponder - I believe it will give you some information on data transfers. You might also go to a serial link page to see if there are in and out bits flowing. (Sorry I can’t be more specific - our Dynon-equipped airplane is at home, and I’m not.....).
More than likely, a configuration has been messed up - that’s where I’d go before thinking hardware. Of course, the obvious thing is to check that you have power at the transponder...then I’d look at configuration/software. It’s just rare when the boxes have internal failures these days. Sure, it happens....but its rare.
Paul