I went out this morning and turned on my bow unit....a Helix 7 Chirp Sonar/GPS using the internal transducer in my Fortrex 80. GPS, time, mapping all worked fine but I had no info from trandsucer.....no depth reading, temp, etc. I had it out last week and it worked fine.
Not sure where to start looking. Any ideas would be appreciated.

Check the cable connections to see if they're snug. If you have another Helix or a buddy who has one, see if you can swap and try and eliminate what is working and what isn't.

 

I had an Ultrex with built-in sonar to a Helix 10 that stopped working, and it ended up being the adapter cable from the Ultrex to the Helix.