Mitsubishi flickering white lights on screen

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)

SOURCE: No picture and no sound after replace lamp for Mitsubishi WD-51525

I was having the same issue after a lamp replacement and the warranty tech said that it was the lamp power supply that went out. The part was on back order and look at the board neaqr the lamp and it had a blown capacitor. This would make since why the lamp would come on then shut off right away. She replaced the capacitor and works fine.

SOURCE: how do you replace mitsubishi tv lamp number

http://www.youtube.com/watch?v=VVAAO25Zing
The above link will give the video how to replace lamp in your TV

SOURCE: I have a Mitsubishi TV

You have failing pixels. The screen is not woking as it should but having said that there is a tollerance allowed by the manufacturers, dependant upon possition.
Sanyo, with their LCD Projectors had a formula to work the problem out, I will not share that with the world as it may give issues later on.
There wer however, a few pixels allowed before a replacement screen was ordered whilst under manufacturers warranty.
Basically, if it gets too bad, as it is out of warranty I presume, a replacement Screen or a replacement set will be reyuired.

SOURCE: I have a Mitsubishi 73" TV model number WD-73735.

Try replacing the thermal sensor. Located behind lamp in lamp housing shroud.