scubadilo, the black box is the control board for the refrigerator and there are various relays on it. If you feel comfortable at removing the cover with no power to the unit check all the connections of each circuit; you may want to get a can of electronic tuner cleaner as this will always be usefull in the future. CLean each terminal with the cleaner and reinstall each, one at a time. IF the display is not showing operation after this, you could have a bad display (called eyebrow in the industry). Good luck and let us know how things turn out.
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Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7
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