I had the same problem. It started with 3 white dots, then 10, then 20 etc. I lost count after 50. After two weeks, there were hundreds of white dots. They told me it would cost about $1000. to fix it. I found a site on ebay under "Light Engines" that said I could buy a kit for $300.
It was what is called a DLP. I put that in, Now I get the (GREEN LIGHT OF DEATH). My TV still doesn't work.