Likely you either forgot to reattach your color wheel ribbon connector, or have it on upside down. It's the tiny ribbon cable behind your circuit board that will come off as you pull the board away from the DLP chip.
If you have touched the chip by hand it can blow the chip by static surge
SOURCE: My mitsubishi 65-inch dlp tv
It's either mirror hinge fatigue or dust on the inside.
Mirror hinge fatigue can be fixed by putting a solid color picture (white or gray works best from what I understand) on the display and letting it sit for 20 minutes.
If it's dust, someone is going to have to go in there and clean it out.
Also could be a defective micromirror device.
Try the first suggestion and if it doesn't work, you're going to need a technician to take a look at it.
SOURCE: bright white spots on mitsubishi wd-73833 I just
Bright white spots on mitsubishi wd-73833 because DMD.
below is example for worst bright dots. If your case like pic below, change DMD.
SOURCE: Mitsubishi 1080p 73'' DLP HDTV - Color distortion
You need to replace the "light engine". This is very very difficult. You need to take it to a repair shop. But this will be very expensive. Around $1,000.00
SOURCE: Mitsubishi WT-42311 DLP Bulb Replacement
Your access should be a a panel near the back or side. You will see that it is somewhat easily removed and should have maybe one or two screws. You will see the casing to the lamp. Go ahead and remove it. Now unscrew the old bulb and replace it with a new one. There is not a lot of screws holding it together. It's a fairly easy process once you find the lamp. You should see the lamp once the panel is removed.
SOURCE: Mitsubishi dlp tv WD65733 has white spots, like
If you get White or black dots all over the screen (DMD symptom)
If you get a pixilated picture (DMD Board)
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