How do i fix the 65 in mitsubishi tv model 65733 air flow problem

you will need to pull the chip out & clean out the dust & other foreign particles that were allowed to fall in & lightly brush off the chip (with a very soft brush, again to remove dust & foreign particles.

Yes, it's very common with this television and they should cover it under warranty.

Check this possible answer I provided and it worked for another similar set:

http://www.fixya.com/support/t12296849-turns_off_shortly_after_turn?mt_f=viewFull162

Your problem is that the DMD device is failing. You're in luck, though. Mitubishi has recently released a replacement DMD device in order to keep repair costs down for the consumer. Take your TV to an authorized Mitsubishi servicer for repairs.

You have a defective DLP chip...

Hi, I have a mitsubishi 65" DLP model # 65733 that I bought in December 2007 brand new, about six months ago I started spoting white dots on my screen that started blinking and then became permanent, thinking is was dust I cleaned everything inside with compressed air without success.
The stars multiply daily to a point that it was intolerable to watch anything with all the white stars and a few black ones that showed up.
We called mitsubishi but got no where, I was out of warranty. (they still deny having a problem with their DLP's)

I had a service tech inspect the tv and was told it could run about $800 to $1000 to replace the light engine with refurbished parts with 90 day warranties.

Researching on line I came across a DLP chip that is compatible with several mitsubishi and samsung models, so I decided to chance it, and replace just the DMD chip before we trash the tv, it was unthinkable to pay $800 to repair a tv that we could buy now for under $900.
Thanks God the "gamble" paid out and the problem got solve with just $150 DLP chip in about 15 minutes of my time.
If you are not mechanically nor electronically inclined, I recommend you use a technician for the installation, but don't let anyone tell you you need to replace the whole light engine, it is a ripoff.
If your problem is just white or black dots on the screen that do not move.......this will solve your problem!!

P.S. Hope this will help you and for the record..... "I will never buy a mitsubishi product again".

the DLP chip is going bad you need to replace it to correct this issue

Ballast Board 1-800-638-3328

Yes, dust is the number one cause to all electronics, i recommend using compressed air to clean the inside every month or so.

If you get White or black dots all over the screen (DMD symptom)
If you get a pixilated picture (DMD Board)