Ronald M Wharton , TX October 12, 2016 Appliance: Samsung Refrigerator RB195BSBB/XAA Samsung Refrigerator Rb195bsbb/Xaa / : Freezer coils not defrosting. How to replace Refrigerator Defrost Thermal Fuse Assembly. New Mainboard an Thermal fuse, Also the display panel stopped working, Checked all lines for continuity an they were good.. Searched the net an found out how to reset the display. Hold the super freeze an super cool down at the same time. Fixed my problem , Works as it should now. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes