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Is your Norcold refrigerator’s rear Power Supply Board damaged or broken. Replace it with Norcold’s 639593 Rear Power Supply Board. This circuit board is only compatible with Norcold Polar N7 N8 and N10 refrigerator models. It will work on any of these models regardless of serial numbers. The tools needed for installing the Rear Power Supply Board are 6 in. needles nose pliers 1/4 in. nut driver #2 Phillips Screwdriver anti static wrist strap masking tape and the refrigerator service manual. This installation procedure should only be performed by authorized service personnel.