As many of us have suffered from Cannon DT4 going down and boards are no longer available I finally found a service to repair them. Either search on ebay or contact me and I’ll forward your request to the provider. Hope this helps.
If you have digi troll 4 rigger that is inoperable because of control board failure. As the boards are no longer available I can link you to a firm that can repair them. Reasonable and highly qualified service. Email me at [email protected]. Hope it helps get your rigger back in service.