Rio units shouldn't have any player-side tuner problems.
Check that the LED on the tuner comes on when powering up the player (it should come on towards the end of the boot sequence, once the player initialises it).
If you're using the extension cable that came with the tuner, try without it.
Check that your sled is wired firmly and the wiring order is correct (see the FAQ).
Downgrade to 1.03.
I've only had one dead tuner module so far, so wiring and software are the likely culprits.
email
[email protected] if you still have problems.