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There is a Sony factory update on these types of TV's. It is an overheat sensor that needs to be replaced with a new design to keep this from happening.
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The Tcon board or the LCD panel is faulty. Can confirm by replace the Tcon board .
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The inverter board is responsible for the backlight so you can see the picture. If the picture just goes off intermittently then that means that the backlight is being turned off. And since the inverter board powers the backlighting you might want to look there.
Could be a hardware issue, If the screen has a power light, does it change coulor (often green to orange) when the problem happens. If so its the screen inst getting any signal. It could be a connector or cable.
This problem with your television set is more than likely a problem with intermittent component failure. The fact that the television turn on for awhile is a sign the the component or components are intermittent.The reason the television turns off is that it goes into the protection mode caused by the intermittent component or components. They are unstable and are causing unstable voltages supplies to appear in the circuits. The television has a built in feedback circuit that will detect the faulty operation and turn off the television. When it stabilizes again the television turn back on. This is usually a sign of aging or faulty components. The problem will only get worse and the television should be thoroughly tested. You can call Magnavox customer support at this telephone number 1-800-705-200. Give them the model number of your television and tell them about the problem you are having with intermittent turn on of the television. They will be able to tell you where to take the television for testing and service. I hope this information helps you with your problem.
I would take it to a repair shop, they charge around $50 to look it over, and then tell you want is wrong with it and they will give you the cost to fix it. This is what I do when TV's go out. It will save you time and money in the long run.
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