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Fault to the main power supply regulator section. Either it will be on a separate board, or on the part of its main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
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Quite a long "description". "How can I fix it without having to check the back of the TV or going to a repairman?" (I altered the spelling etc a little there.)
Answer: Go to the internet and search for "Magic TV Repair Wand" and let me know if you find one---
Sometimes when the TV recives a brodcast signal for a new update to the mainframes firmware, it will have to turn itself on to install/recive the update and aslong as it is connected to a power source it can do this. hope this helped answer your question. Have a good day :)
These usually have a good Warranty as this is a Best Buy product. They would be sure to fix it under the waranty if you take it in. They would be able to give you an estimate of repair if you take it in also. They may have a flat fix fee or possibly an hourly fee along with what the power supply or bad part cost. Usually a power supply problem. 42" is still an expensive TV to replace. May be best to repair. Blessings, A/V Guy
Many possibilities a Tv can shut down by itself. Check whether remote control timer is activate or not. If not, you've to get a Tv tech to troubleshoot the problem......
camcorder when turned on flashes in red DEW and closes it self down. i have taken all the batteries out and replaced sometimes after a few days the camcorder will work then DEW will rea ppear and shut itself down
The set is going into shutdown,there are a few reasons why the circuit is being activated,excessive high voltage,excessive volts supply(poor regulation)no screen voltage or a secondary supply is missing,if you are familiar with tv service you have a few places to check,you will need a volt meter and a soldering iron and the squematic diagram to locate the different circuits mentioned,if you are not too familiar seek the assistance of a servicer.Let Us know if you need more information.
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