My set switches from low lamp to bright lamp on its own constantly

Mine is doing the same thing. I think its the cooling fan. The bearing is probably gone.

have a good look at the color wheel which faces the lamp

Hello
If you set the lamp mode to LOW POWER, each time you turn ON the TV the lamp will start out at HIGH BRIGHT mode, but will switch to Low Power mode after a short period of time. You may notice a change in screen brightness when this happens. This is not a malfunction.
Just check whether you have selected this mode. Go to its user manual [P57]. All details are there about the lamp brightness settings. If it is not set to Low Power and still you get a dim picture, the lamp may be weak and has to be repaced. OK.

I have researched the owners manual and it states to recheck the lamp door and make sure the lamp is seated properly and that the door is closed tight. I can email you the manual if you do not have one.

[email protected] Lawrence Brown

If any of the following conditions exist, turn off the TV, unplug the power cord, and repeat steps 1-9 to ensure that the lamp unit and lamp unit door are installed correctly:
• No picture • Dark picture • TV will not turn on
If, after repeating steps 1-9, the problem still exists:
• In the U.S., call TACP consumer solutions at 1-800-631-3811.
• In Canada, locate the nearest Toshiba authorized service depot by directing your web browser to www.toshiba.ca; click "Home Entertainment," and then click "Support."

hi,
check the brightness setting on ur tv. if u have already checked it, then check ur tvs lamp. its time to replase the lamp. may be its reflector get damaged. thats why the brightness is low.
ok

It could be your Light Engine. However, I would first check a few things:

1. Make sure your Low Power/Lamp settings are adjusted so that they meet your brightness needs.

2. Make sure you used a Mitsubishi original lamp, as generics get chewed through fast and hard.

3. Try another lamp; sometimes you can get a bad one in the bunch.

All those things don't work, consider a Light Engine ($400 + for parts; $300+ for labor)

http://www.fixya.com/support/t251039-46_toshiba_dlp_projection_picture

I have a solution for The United States of America! "If We Don't Make It, We Don't Need It".

Personally, I believe if we went back to actually manufacturing things in this country and stopped importing everything, a lot of these problems would STOP!

Think about it America!

unplug all nite.

most probably you have a bad bulb. in most cases you can take the bulb out and you will see it cracked inside the glass mirror.anyway the first approach is to replace the bulb.the part number should be on a label on the bulb.if you can not find it leave a message and i will find it for you.