I have the same issue!
It's like a purpling on the top and bottom of the screen.
I have a 2 year old LG 60PZ550. It has worked great up until a couple days ago. I am wonder if anyone can diagnose the problem by looking at the attached pics. I have tried different inputs, different cables etc. It appears when I watch both directv and the xbox. I also seems to cause a flicker or at least thats the best way I can describe it.
Any help is appreciated. Thanks!
pic 1 http://www.avsforum.com/content/type/61/id/157427/width/350/height/700/flags/LL