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Although not a great solutin it does allow me to use my fairly new and expensive LCD TV. Heres what I do, UNPLUG THE TV FOR 20 -30 MINUTES, WHEN PLUGGED BACK IN YOU NEED TO VERY QUICKLY PUSH THE POWER BUTTON ON THE TV.
Let e know if this works fo you.
If you are electronically inclined, replace the three 1000uf 16v electrolytic capacitors in the power supply board located above the power switch. They are likely bulging out at the top and failed. They are the three in a row at the top - center of the board, located between the two black heat sinks. Make sure you get caps rated for 105c degrees! I recommend replacing them with 1000uf 25v caps. 35v caps will work but might be a tight fit as they are larger diameter.
Should cost you about $8 for the parts shipped. You can get them from partsexpress or digikey or any good local electronics store. Your local radio shack may have them but they won'y be 105c and thus may not last long.
Not handy, ask around, there is usually some electronic tweaker guy around that will install them for a few bucks.
This has solved the turns on / then off problem every time in the 3 I've done.
First do a hard reset by unplugging it for a couple hours, then plug it in and try again to power it on. If no change, or power light just flickers then goes off again, your power supply may need rebuilt or replaced. Try this reset first, post back if no change.
See my other support issue regarding a simillar problem:
Since this is a row of dead pixels and the TV is under warranty, you need to either contact the manufacturer or even exchange it at the retailer you purchased it from.