Technical Pioneer avic HD-1BT

[Taffndebs]

Hi
I have one of these radios which was working great I turned up the volume (not sure if this caused the problem) and everything went blank I’ve looked at the cab fuses all good have taken the unit out and found a 10amp inline fuse all good. And now I’m stumped as to what to try next and ideas gratefully received

 

[theoneandonly]

I have a later pioneer in a Rapido motor home it has 3 fuses (one in radio) one engine off back up system and a switched LB in the Hab fusebox (CBE)