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There are several reasons why your Toshiba DLP projection TV might be turning off after a few minutes. Here are some steps you can take to try and diagnose and fix the issue:
Check the lamp: The most common reason for a DLP TV to shut off after a few minutes is a faulty lamp. Check the lamp to see if it's still functioning properly. If it appears to be damaged or has reached the end of its life (typically around 2000-3000 hours), replace it with a new one.
Check for overheating: Overheating can also cause the TV to shut off. Check the fan to see if it's running properly and clean any dust or debris that may be blocking the airflow.
Check for firmware updates: If the TV's firmware is outdated, it can cause it to shut off. Check the manufacturer's website for any available firmware updates and install them if necessary.
Check the power supply: A faulty power supply can also cause the TV to shut off. Check the power supply unit to see if it's functioning properly and replace it if necessary.
Check the color wheel: If the color wheel is damaged or not functioning properly, it can cause the TV to shut off. Check the color wheel for any damage or signs of wear and replace it if necessary.
If none of these steps solve the issue, it may be necessary to have a professional technician diagnose and repair the TV.
It sounds like you have a bad ballast board, or possibly the power supply going to the ballast bulb. I'm afraid that if you do not have the repair experience on solid state TV sets, you will need to contact and authorized Mitsubishi repair center. Good Luck
Without a brand AND model number or a better description of the problem, any suggestions would be nothing more than a guess.
Unless you are prepared to repair the TV yourself, professionally performed repair, even simplest ones, will probably exceed the cost of a new LCD replacement set.
Due to X-ray and other safety concerns (equipment and/or people), CRT TVs constantly check the voltages and signals required to make a CRT work. A few seconds grace is allowed during start up but after that, any excessive high voltage (real or imagined) or loss of beam deflection circuits will cause the TV to turn off.
Please do the following:
1. Move the TV to a quiet and preferable totally dark room.
Wait until night if necessary.
2. Stand within an inch or closer to the TV screen.
3. Turn on the TV and look and listen for the following:
a. Whoosh sound and/or head hair attracted toward TV screen
Yes. High voltage activated and charged CRT screen.
No. High voltage failed to activate.
b. Hissing or normal sounds from the speaker(s) while set is on.
Low voltage circuits probably okay. Defective low voltage regulator can cause high voltage to exceed limits.
c. Entire screen briefly lit up or single bright spot at center of TV screen
High voltage worked for a moment then the TV shut off due to over voltage or current problems.
d. Brief bright line from top to bottom or single bright dot on TV screen
horizontal deflection circuits bad
vertical deflection circuits ok
TV shut off due to bad deflection/sweep circuit
e. Brief bright line from left to right on TV screen
horizontal deflection circuits bad
vertical deflection circuits ok
TV shut off due to bad deflection/sweep circuit
It would be helpful for you to perform the above "up close and personal turn the TV on test" and report what happened.
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My new sony xbr 55hx929 on occasion shuts itself off and comes back on within a second or two. shuts off to the point when it comes back on the sony logo on screen is displayed and in the upper left hand corner the input (hdmi 1) is shown follow by the program on tv.
sounds like dust collected on the internal parts which after enough time can cause it to stop working. either have tv repair specialists replace the mother board, or replace tv
it is a brandnew tv, so expected that it is under warranty,, it best for you to return where you bought so the warraty will not void. Big possible of factory deffect.
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