I have White and black dots on the screen of my Mitsubishi wd-73833 tv.

I developed white spots on the screen of my Mitsubishi WD-57734 in increasing numbers over days and weeks. I called a repair service who quoted me $1500 to replace the light engine. He suggested I call Mitsubishi Customer relations at 800-332-2119 option 5 which i did. To make a long story short after several conversations with them they agreed to replace the part for free if I picked up the labor (Would have been less conversations if I had the original purchase receipt). Instead of $1500 I paid $250. The tv was only 3.5 years old. Perseverance paid off.

Replace the DLP in the light Engine.