Question about Toshiba TN55X81 55" Rear Projection Television

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I have a tn55x81 that shuts off after only a few min. like its over heating or something...if you unplug and plug in again it will do the same thing. If it stays off for a few hours it will last a little longer maybe like 5 min. but still turns off by itself. what could be the problem?

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  • dernst488 May 10, 2010

    Thanks for the info. I'm pretty sure the timer wasn't on. I had reset all the settings on the TV. It seemed to stay on shorter the longer it had been on. I will clean all the dust off the boards and see if that helps. If not i'll play with the power switch to see if that changes anything. I will let you know if I have any problems after this...

  • dernst488 May 11, 2010

    Cleaned off all the dust of all the boards and still did not fix it. All the heat sinks are clean. Even tried to get to the power switch and dusted that off. Still didn't stay on. One thing I did try was to unplug a few connectors that had RED, GREEN, BLUE on them. (see pictures) First i tried unplugging them all and that seemed to work,but the colors and the picture where off. (kinda figured something would happen) BUT it stayed on!!. So then I turned it off plugged in the GREEN one and tried it again....Still stayed on. Turned off, plugged in the GREEN, and RED one....Didn't stay on. Turned off....plugged in the GREEN, and BLUE on Didn't stay on. Any Ideas???? This board is on the left side of the TV if your looking at it from behind. It's kind of on stilts.

  • dernst488 May 12, 2010

    I have tried this and did not work. I did try however to unplug some connectors on a board located on the laft side (if viewed from the rear) it is on stilts and has two big heat sinks on it. I had removed all three RED, GREEN, BLUE connectors and it had stayed on!! i then proceeded to power down and plug in one connector at a time. Powering down each time i added a connector. first time pluged in the GREEN only. It stayed on! Then GREEN, BLUE only and it stayed on. then I tried pluging in all GREEN, BLUE, RED. and it turned off by itself again. What could be the problem. Obviously the picture was off and blurry if one of the connectors was not plugged in. Please tell me what might be wrong with it....



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Could be overheated capacitor or a faulty power inverter. You can get an analog tester or ohmmeter and test the capacitors. And you can use a voltmeter to check the power inverter.

Posted on May 12, 2010

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firstly, check your TV settings and to confirm if the timer is on or not. The timer might be the reason your TV turns off frequently.

If the timer is not on, then the timer is not the cause of the problem.

There are two reasons why your TV keeps turning off, 1) could be the on/off button. The button my be popping of at interval, that is, it may have worn out and not hooking well. 2) could be over heating. The heat sink maybe dusty.

Either way, the solution is quite simple. The on/off button simply toggles a low voltage circuit that powers your TV. If it is dusty, it may complete the electrical circuit and send a false signal.

A heat sink may be dusty and unable to dissipate heat. Over temp protection may be switching the TV off.

Allow the TV cool, open the TV back cover and clean the dust off the circuit boards. You can use a paint brush to remove the dust from the TV board.

Good luck.

Posted on May 10, 2010



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