Tommy P Bard , TX September 13, 2014 Appliance: Frigidaire Refrigerator LGUB2642LF3 Frigidaire Refrigerator Lgub2642lf3: Error code on a frigidaire refrigerator "sy cf" caused by a power surge taking out the main power circuit board. How to replace Main Power Control Board (Pcb Assembly). Replaced the main circuit board 51 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes