it used to be an issue from when older projection TV's were fluid cooled , but modern lcd projection tv (like this one) don't have any issues in cold weather other than it will take several minutes till picture comes into focus in extreme cold weather , but should not give any long lasting effects once its up at operating temps one thing though don't move it once its hot during cold weather or lamp light source will go out , one thing that will cause long term problems is if its subjected to high humidity (water) this causes all sort of corrosion problems in sets of all types
You can use compressed air but it will leave the dust inside. If you remove the bezel you can take the front face off and clean it that way. I would not recommend using cleaning solvents to clean the screen use a dry cloth. The screws are on the back side along the edge of screen.
Maybe a bad lamp. Where did you get it? If a generic one it may not be compatible with your set even though they claim it is. Make sure you have one that is from factory or factory equivalent only. Low cost online lamps sometimes are big problem.
Fortunately, this model lamp is not too expensive.
After years of usage, the Mitsubishi WD-60735 starts to show some white dots, they begin to increase day by day all over the screen.
The problem is related to the DMD chip Part# 276P595010.
The part is about $200 you may find it used and cheaper on ebay.
Good luck
www.aaatvservice.com
Red Lamp no longer illuminates and has
reached the end of the lamp life.
Replace the lamp. The TV will not operate when the lamp no
longer illuminates.
or you made need service for the tv..
Press the System Reset Button which is on the RHS on control panel
If the TV fails to respond to the remote control, control panel
buttons, or will not power on/off, press the SYSTEM RESET button on the control panel.
The green LED on the front panel will flash quickly for up to one and a half minutes. When the green LED stops flashing, you may turn on the TV. Recent setting changes you made before using SYSTEM RESET may be lost.
If that fails try pressing and holding the menu button for 8 secs
user manual is here:
http://content.abt.com/documents/19051/WD_C-735-736-835-series_om.pdf
With the plug from the t.V. unplugged from the wall outlet, remove the tv cover. Follow the power cord to the power supply's printed circuit board. Look to see if there are any damaged, bulging or burnt out (exploded) capacitors. If there are, that's the source of the problem.
Be fore warned, even though the power cord to the tv has been disconnected from the wall outlet, good capacitors still hold (store) hi-voltagesthat can shock & even kill you; so don't touch them unless you know how to properly discharge a capacitor. Don't underestimate the power that these components store even though they are very small.
See this video 1st : http://youtu.be/AvlNKZ8GzEg
and this one as well: http://youtu.be/B41PeSDF_dk
Warmest regards
There is a good post on this subject at the FixYourDLP's blog... I believe your issue is result of a defect DMD DLP Chip. You can read more about this issue here:
http://www.fixyourdlp.com/2012/08/10/replacing-the-4719-001997-dlp-chip-in-the-mitsubishi-wd-57734-rptv/
