i purchased a 46510 from Sears in May. The first one was dead out of the box. They delivered a new one and everything was fine. In early Aug I heard a loud snap sound and the black level changed. It had "green look" to it. This lasted for only a few min. Then everything went back to normal. A few weeks after that the problem would come back on an intermentent basis about once every 5 min or so. I called for a service app and the guy told me there was a service notice out on this set about a problem with dust on a circiut board that was causing a short that was interment and he cleaned the area and said it was sealed now and that should take care of it. It was supposed to be a problem that occurred during assembly. Now about three weeks later the problem is back only it seems to be worse. In fact the set seems to flicker with the "green look" to the black levels. I have called for another service ap on Tues. I turned the set on this morning and the problem is not there. I am going to see if the problem comes back after a little warm up time. So basically in 4 months I have had 1 DOA and 2 services apps. Has anyone else heard of this problem with the 510 series? do have the ext warranty. What do you think the odds are of a replacement since I have had these problems in the first 4 months?