I have small whitr dots on my picture screen

This could be something on the lens or mirrors. you can open one or both porthole covers on the left or right side of TV to determine if this is the cause. You can look at the mirrors & lens to determine if a bug or dust has gotten on either part. Then clean.

HOWEVER, the most likely cause is the DLP chip. this causes white & or black dots. May start out as one or two, then multiply.

See the following website for the proper DLP chip for your Mitsubishi model#:
http://www.shopjimmy.com/catalogsearch/result/index/?cat=24&q=dlp+chip

You need a new DLP chip. The chip has little mirrors that are black on one side and white on the other side. When the chip wears out , your screen will turn white one dot at a time or black one dot at a time or they may just all stick shut at once. Since your screen is black, all your mirrors are closed. You can buy the chip from shopjimmy.com and they have a video of how to replace the chip so you can do it yourself. It takes about 1 1/2 hours. The chip is about $160. To have this service done for you is about $200. Do it yourself and save the money. Your tv will be just like new again. Just make sure the chip is in perfectly level or when you turn your tv back on, your picture will be slanted. you won't notice it on the picture itself but words on the screen or scrolling messages and the menu will be slanted.

http://www.tomsguide.com/forum/57674-4-white-dots-mitsubishi-screen

projection tvs can display white dots from the dust that is on the reflector mirror your lamp shines the picture on before it is reflected onto the front screen of your tv, one must be very careful when cleaning this, may be worth a service man doing it for you

It's a connection inside the TV that's faulty. It could be as simple as reseating the ribbon cables that connect the control board to the glass display. Or it could be that the fault is on the board and needs to be replaced. The fact that the problem comes and goes should tell you it's fixable.

Optical-Eng PN# 938PO75020 Encompass Parts Distribution has 5 left in Stock
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PTS rebulit Optical Eng. 1-800-844-7871 Call and ask what they charge.

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

Try booting into target mode by holding down the T key during start up. If it starts up you can rule out a failed disc drive. If it doesn't start into target disc mode you likely have a failed hard drive. If it starts up into target mode you can try starting it into safe mode by holding down the shift key during start up. This will also run a series of disc repair routines and start up will take some time. Hope this helps.

The only thing you can try is to adjust the tiny control on the Y board, if you want to try do this. Open the set , set it up so you can watch it with the back off. now looking at the back on the left side you will see a circuit board larger connected to a smalled one or two that go to the screen edge . on the larger board look for a few small controls, mark their positions with a dark sharpy then turn each a little while looking at the dots to see if one makes them better or worse. If one control effects the dots try to center it for the least amount of dots, if no effect is observed when a control is turned return it the original position that you mark before starting. if the dots do not clear either the Y board is bad or the whole scfreen is defective.
gd lk
Eric

I’m happy to help further over the phone at https://www.6ya.com/expert/eric_ab7c09ec01841771

If your Mitsubishi TV has white spots in the picture , you can call Mitsubishi @ 1-800-332-2119 and request a free DLP Chip to fix the problem. They will send the New DLP Chip at no charge to a TV Tech in your area to install it for $200 flat rate. That is about a $250 savings if you had to pay for the chip . Call them with your TV's Model number and serial number and let them know when and where you bought the TV.
It saved me some hard earned money and now my TV is like New !