Model: GE PSS27SGMB BS

I changed the motherboard of my refrigerator it works first then after about 6-7 days the temperatures on freezer supposed to be 0degree went up 12degree, refrigerator side supposed to be 37degree went up to 44-47 degree then I looked at the mother board it was part burn out near the big resistor. Ref and freezer still works but not the correct temperature. I looked inside my freezer and saw frost mid-bottom. Can somebody please help me what is going on. Thank you very much.