Andy, there is not a hardware problem - it needs a software reflash. The Tx was working perfectly before I screwed up and disconnected the battery while the unit was still turned on.
So (hopefully) no hardware required. I do understand the replacement parts issue.
This "Backup failure" seems to be a well documented issue with this generation of DX7s.
I want to get it working as I use two of them interchangeably for combat.
(BTW, I do have a more modern JR X9503 DSMX unit for my mainstream flying).
Last edited by kaydeejay; 06-23-2018 at 09:23 AM.