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We have a six-year-old giant screen TV. Wen you turn it on, the picture turns off exactly forty seconds later. The picture looks fine until it turns off. About three seconds after the picture shuts off, the TV shuts off.
It seems as though the bulb(s) in your unit are about to go out. This is repairable/replaceable by calling your manufacturer. If you are still under warranty they can help you by possibly troubleshooting/replacement/referrals.
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Could it be vertical IC loose connection. It is sometimes connected with correct tuning. Check it for crack or wiggling connection best is to resolder.
The most common cause for what you are seeing is a shorted gun in the picture tube. When 2 elements (heater and cathode) of one of the guns inside the neck of the picture tube touch, that gun goes full on and overloads the flyback (high voltage) transformer. If it is in the blue gun, the screen will go bright blue with light blue "retrace" lines in it. The computer senses the overload and shuts the set off. At 2 years old the tech most likely tried removing the short by arcing between the elements. This works sometimes but the short often comes back a few months later. Another attempt at removing the short could be tried, and it might work this time, but it may or may not work for long. The ony other solution is to replace the picture tube but that would cost much more than the set is worth. A qualified tech will be able to tell you if this is the problem in your set.
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