If the dots are stationary and are always in the same place, you most likely have a DLP (DMD) chip failing. It must more cost effective for a service tech to replace that chip than to replace the entire light engine.
i have white dot on my dlp the tv is almost 3 yrs old it started with 1 dot about a month ago and has progressed i now have about 12 some flicker but most are steady what should i do what parts ? and how much will it cost me. I know their is a lot of people with the same problem and most post say dmd board or dmd chip or the entire light engine

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic