Question about Mitsubishi WD-62725 62" Rear Projection HDTV-Ready Television

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TV shuts off on it's on after about 20 - 30 minutes of play

I initially thought the problem was signal related, but have tested three different inputs and none of them solve the problem. TV will freeze then shut itself off.

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Freeze like the picture is in pause?

picture freezing is desired function on the remote and handled mainly by the "picture and picture" circuits. but the video that is involved and processed there is handled by many circuits and microprocessors.
what you describe is an intermittent heat related problem if you almost can set a watch to the the shut-off time. you can feel, if your a tech, what part is running hot with a finger or start freezing a suspect part with freeze spray and see if stays on long past overdue. make sure your vent holes in the back are not covered and keep the back at least 1/2 foot from the wall.

Posted on May 24, 2008

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Posted on Jan 02, 2017

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My Phillips flat screen picture flips after being on about 10 minutes no flashing lights I switch the format and it straightened up for a minute but started back flipping can you help me assess this...


Vertical 'flipping' is almost unheard of with modern digital video. Are you receiving your signal via the coax antenna or cable input? You might try using a different input method and possibly a different source (DVD player etc.) to see if the problem is consistent. You might also check the refresh rate of the TV and try changing it. If the problem only happens after the TV warms up, you may have a heat related electronic problem with the TV. Try blowing a fan on the TV too see if this delays the problem for 5 minutes or so.... If it's heat related, it will likely be an expensive repair unless it's under warranty.

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Hi.

If the problem happens using different input and devices, then it is either the terminal circuit (input/output connectors) or the processing unit in main board. The terminals are unlikely the culprit if problem concerns different inputs.

I imagine that the picture is not properly B&W (gray-shades) but some kind of reddish, bluish or greenish picture as the LCD will process picture using RGB (red green blue) channels instead of CYMK (cyan yellow magenta black) like CRT TVs.

Test the TV using an external aerial. You will notice if the channels have the wrong color even from static.

Use different inputs, different cables and different devices. beware of SCART cables, the SCART contacts are very easy to break. A defective cable will loose picture. Better testing using AV cables and component cables. AV cables are red/white for sound and yellow for video. If the two-wired yellow cable does not work, then the TV is faulty.
Other test can be done using component cables. Component cables send the three red-green-blue signals on different cables, hence testing is simple. Test swapping cables and see if TV tone stays the same if color tone changes the problem were the cables. Test also using at least two different devices (e.g. one DVD player and one TV receiver or a playstation).

If you find that the TV is defective call the manufacturer at the number listed on manual. If the problem is that one or more RGB channels do not work the TV main controller board must be replaced.

Regards.

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If this happening when TV is viewed then it is possible that the auto shut off is active as no signal is detected by the processor and so is instructing to shut down.
However this fault is related to a problem in the signal detection circuit, if this happens with the auxially circuit- play station- then some logic gate is faulty which needs to process and detect the signal.
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Go over here: http://denon.custhelp.com/cgi-bin/denon.cfg/php/enduser/std_alp.php?p_sid=1NlVrsDj

I have some Denon components myself and had some problems. Ask them here, and within a day you should have solution for this problem.

Probably you have to reset the device to factory settings.

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If this is only happening on one input like your cable input and the dvd player is working great on a different input, then the issue can possibly be signal related and not a problem with the tv, if this haapens on any input you are watching, check to see if it affects the menu if it does then your looking at a Logic board issue, if it doesn't affect the menu but happens on multiple inputs then you have to replace the signal board

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