We are having white dots appearing on our Mitsubishi DLP 65 inch television, approx. 3 years old. It looks like a constellation is appearing. New dot every day.

DLP/DMD chip is failing. you need a new DLP chip for that model TV. the pixels are sticking. it will get worse as time progresses.

If you have the white dots issue, you can replace just the DLP chip. I did it, took about 45 minutes after watching a youtube video. Here's the one I bought. Been about a year and no new problems. http://www.shopjimmy.com/mitsubishi-276p595010-dlp-chip-dmd-ic-new-original.htm $189.

had white dots on mine as well i changed the dlp chip and put it back together and got the white vertical lines i decided to check all connections and make sure the chip was locked in correctly
it was not locked in securely i reassembled and now problem solved picture looks brand new so always check connections before assuming its the dmd board

White does suggest (dots) a damaged or bad optical light engine.

dip chip

the DLP chip is going bad you need to replace it to correct this issue

Mine started with only one small white dot..... just a week ago, now I have a freakin constellation!!!! (at least 30) . I am gonna call samsung today to see if they will cover this even though it's out of warranty. I believe it to be the micro mirrors

If you get White or black dots all over the screen (DMD symptom)
If you get a pixilated picture (DMD Board)

Actually you must replace the DLP chip that is buried deep in the works of the tv. Unfortunately this can run into a nice lump of change. Do what I did. Perhaps you've heard the old addage

The random whit dots you are seeing is more than not the DMD or million little mirrors board. The white spots represent some of the mirrors that are sticking in the on position. In that case they are always reflecting white light from the lamp. I don't concider the DMD board a do it yourself repair since on the older DLP set it requires mechanical alignment as well. The best thing to do is contact a techincian and see what they might charge to repair the TV for you. Please take a few moments to rate my answer...Thanks..