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hi my name is Robert....
Most likely you have a power converter, a power converter will take the incoming AC voltage and make the DC voltage....... What I would do to see if the converter is the issue is go to the fridge and find the DC supply wires going into the fridge. Get a 12 volt battery and a set of jumper wires, hook the battery (power and ground) to the fridge and see if it runs normally. IF so good chance the converter is at fault.... Robert