Diana M London , KY June 30, 2014 Appliance: Frigidaire Room Air Conditioner LRA257ST21 Frigidaire Air Conditioner Lra257st21: Pc board did not work on air condistioner. How to replace Electronic Pc Board. Ordered pc board on Sunday and got it on Tuesday. I took apart the pc board and replaced it with the new one. It worked perfect and I was really pleased with the service and how fast that I got the part that I needed. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes