You are probably talking about the LED light engine? I had to have mine replaced at about 2yrs old. I bought my set at Tweeters, also purchased the extended warrantee (5yr). On/Off cycle was repaired less than 12 months, then all the LEDs shorted less than 2 yrs old, tweeter service guy replaced the LED light engine, looked terrible, then half the screen went black, another light engine was installed, pic quality came back, still half the screen went black, right or left, every couple minutes, talked to Tweeter about replacement, they agreed, went bankrupt, no warning, before replacement came in, stuck with defective 5679, ext warrantee refused any more work on it, had to pay $2000 for 40" loaner that tweeter put on my card. YETCH!! I removed the back cover and pointed a fan, from the back, at the 2 small fans left of the speaker where all the copper tubing is at and the set worked OK for close to a year leaving the back off. then it went green. I GIVE UP!! Going to try calling ECR.