How do you know the camera's have no power? All you get is a black screen on the radio. That could be a disconnected signal wire somewhere, a loose connector, or the switch box messing up--I believe the Axxera's only have 1 camera input and there may be a switch box under the panel above the gauges (someone with an Axxera correct me if I'm wrong).
If all 3 camera's are out I'd suspect the connector at the back of the radio--perhaps it worked its way loose? (This happened to our side cameras on our Jensen radio--I pulled it out re-seated all the connectors and made sure they were tight; no problems since.) Or perhaps the wire at the switchbox is loose, or the switchbox lost power.
So many things to check...
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