Only static on my backup camera

[Just Cruisin]

I have a BT Cruiser 5291 2018 with a Ford 450 engine. The backup camera display is only showing a white screen with static. It worked fine on my last trip but has been stored for winter with only the occasional startups of the motor and generator to keep the batteries in good shape.
Any ideas on what might be wrong and how to resolve it would be greatly appreciated.