Keith B Eclectic , AL July 10, 2022 Appliance: General Electric Microwave PSB9120SF1SS Ge Microwave Psb9120sf1ss: GE Advantium microwave… no power except for a single digit flashing on display. How to replace Pcb Electronic Power Board. I checked all the fuses and thermal resisters, capacitor for continuity all were good. No one in my area wanted to work on the appliance. So, I figured it was the display or power circuit board. I replaced both and the oven is fixed. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 2+ hours