I have two Lynx 3d radio that suffer from the same problem.
One if 75mhz the other is 29 mhz.
Both get no output to the servos... I have very limited radio get to switch around but its strange for both to have the same problem.
I live in Australia so support and spares arent the easiest to get. and the products (especially the 75meg) were purchased here.

Any advice would be great.