I have bought an Lg lh90 led TV 3 months back. It works well, but yesterday I noticed that there is a black dot on the screen of it. first I think that it is dust, but when I went closer to it then I came to know that it is not a dust particle, even one of the pixel stopped emitting the light. I called the customer care and he said that he will come to fix it tomorrow. It is in guaranty period so tell me that do I need to change the entire panel or what?