Nicholas K Oneill , NE June 23, 2014 Appliance: Electrolux Refrigerator EI28BS56IS5 Electrolux Refrigerator Ei28bs56is5: Sy ef. How to replace Refrigerator Control Board. Evaporator fan would not run. I replaced the evaporator fan, but that did not fix it until i replaced the main board (power board). the board is underneath on the left side with one screw holding it. I figured there was only one main board but there are multiple; you have to read descriptions to get the correct one. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes