TV shuts off and red standby/timer lights blinks red until I power the set off. When it shuts down it does so with a very loud snap. When I turn it back on the screen is blue and has light blue horizontal lines. It usually has sound. Within in seconds it will shut down again. The set is 7 years old and works great except for this problem. When it was 2 years old it was in the repair shop with this same problem and it cost almost $300. Within six weeks it was again having the same problem but stopped and worked fine. It can go for months without shutting down. It has been inoperable for 4 hours at this time. At one point, 3 hours, I had a picture and then is shut off again. Any suggestions on how to repair would be appreciated. Also, an estimated cost would help determine whether to repair or replace.

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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.

Posted on Aug 21, 2007

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