White halo fuzzes the picture on TV

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

Could be dead pixels depending on the TV.

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

Mitsubishi that the one,who u should contact.Talk to them make some kind of deal with them to help u to do a repairing or replace the tv Light Engine Projection Block.That the tv problems,this problems a design flaw on the tv Light Projection Egine Block the IC they put in that causes of this white spots are showing up will continue showing up more and more white dots.It will not stops.

Projection TV sets are known to have two common problems. The first problem that is common to these sets is convergence failure. When this happens the TV will usually look 3D, Wavy/Distorted, etc. It may also shutdown and blink an error code.

The second common problem with Projection TV sets is dull video, halos around objects, white looking video, or red overpowers the screen. This is commonly caused by the fluid in the lens being clouded overs. To get fixed either call in a local TV repair company or goto sites such as Tv Repair Kits to get a repair kit with instructions. Here is there link.

http://www.tvrepairkits.com/xcart/home.php?partner=papa1dude

They have put together complete kits for most models that include the parts, step by step photo instructions, repair assistance, etc.

the white dots (sometimes you get black ones too) are caused by a faulty DLP chip. you can find the replacement for your TV at the following website:

http://www.shopjimmy.com/dlp-chips/

There are two common problems with Projection TV sets. Problem #1) Convergence Symptoms:

• Screen Looks 3D
• Colors wont align
• Video may look distorted

Problem #2 CRT Fluid has clouded over. Symtoms

• Dull looking video
• White looking video
• Halos around objects
• Red/Orange looking video

You can see some examples and find a fix here...

SOLUTION http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

you need to replace a cople of the opticoupers most likely, if you want to repair this and save yourself a lot of dough, contact me at techman32k-at-yahoo dot com
Larry Dillon

Inside of your TV their is a fluid that keeps the tubes cool. Over the years this fluid will turn cloudy and cuase the screen to look dull, bright white, have halos, etc. You can get the fluid over the internet from various sources or your can get a complete kit including repair instructions from www.TvRepairKits.com.

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images. 

What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.