Thomas S Piedmont , OK February 02, 2015 Appliance: LG Refrigerator LFC21760ST Lg Refrigerator Lfc21760st / Astclga: Inside lights stayed on causing plastic display case to melt. How to replace Refrigerator Control Panel Housing Case. Replaced Pcb board. After verifying Pcb corrected light problem. Replaced display case. 2 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes