Example answer at https://answers.yahoo.com/question/index?qid=20110121115857AAE1jP4
To get away from any blooming we move to plasma or higher end models. It sounds like you already had service and it's time to change models.
I bought an LG 49UB8500 and i has a blooming issue with uneven lighting especially in the corners and edges. I understand some blooming is expected but this was bad enough that I sent them some pictures and they scheduled a replacement lcd screen. The first replacement was totally defective and I had them but my original screen back in. LG refered me to another repair shop I sent the pictures in and LG got them and replaced my lcd screen a second time. The new screen had worse blooming than my original screen. I took several more pictures to show how bad it was and now LG is saying this is expected for this technology and would not replace it again. I asked them to look at my picture and tell me that that is considered an acceptable amount of blooming and they just said they would talk to the engineers again but they already made their decision. Has anyone else had issues with blooming (uneven backlighting) on their LG TV? I can post a picture if anyone wants to see how bad it is.