G U Sicklerville , NJ November 17, 2025 Appliance: LG Refrigerator LFX21960ST/00 Lg Refrigerator Lfx21960st/00: Refrigerator shuts down after a few seconds. How to replace Main Electronic Control Board. Replaced Main Electronic Circuit Board On Thursday morning I came downstairs to a dead refrigerator. I unplugged it for a few minutes and after plugging it back in it briefly stayed on for a few seconds with a blinking front panel before shutting off. After an internet search of the symptoms, I suspected a failed main circuit board. I subsequently ordered a new board from AppliancePartsPros that arrived Friday morning. By the time the new part arrived, I had already disconnected and removed the old board. I promptly installed & connected the new board. Said a quick prayer before plugging that baby back in and SUCCESS! Back in business without the expense of buying a brand new refrigerator! The geek in me always thinks repair before replace and I'm thankful it paid off this time. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes