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11 blinks Fan SOS PB Board. Either the cooling fan or its control board is faulty. You have to check and locate which one has the fault. Check this link and select the site mamed 'Electro-help' for more details.
Power supply is my initial thoughts, but then again it could be that one of the three CRT's tubes has an issue. My thoughts is that it would be best to bring it to a good TV repair shop. Why spend money on a power supply and then find out it's a CRT. Blessings, A/V Media Guy
1.Check first if the shutdown of your tv follows a certain period of time. Example after using it within 12 hours it automatically shut down. If so the the matter is only on settings of your tv. 2.But if your tv shut down at an irregular time the problem is in your board. In this case if your tv still work but still shutting down automatically its better not to use it so that their will be broader damage. 3.The most common defect on this case is loss contact of components due heat and mechanical undergone during the usage of the tv. If you know how to resolder board, try to resolder the components specially those who are showing loss contact. You can recognize it because a good solder one has shinny and no round like on the soldered surface.Try also to resolder important parts such as IC's and transistors. note : a good resolder needs to be done in order to avoid problems and damage. 4.Another possible cause is the tack switch for channels,menu,power and etc. You can remedy it by spraying it a contact cleaner. 5.If the problem still going even after the procedure its better to bring it on reliable and trusted service center.
Since your plasma is less then a year old, I would suggest to contact the manufacturers to get it fix under warranty. If the plasma keeps shutting off by itself, that is not normal and should be repair.
Look for the computer processor inside the TV. It needs to be cleaned. A can of compressed air will work. The processor is overheating and causing the tv to shut off. Look for the small fan that is supposed to keep the processor cool then remove the dust.
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