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If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.
You should try tristatemodule.com it sounds like its your main board thats shorting out give them a call and they can give you a cheap price on a replacement and guide you through the repair over the phone.
You will either have a fault with the inverter board which drives the backlights or a faulty backlight in the screen. If the problem is a backlight then a replacement screen is the only cure. One or the other is breaking down after it has been opn for a certain period of time, have an engineer call out & check with a tester if it is a screen problem.
Call LG. They will have you go through diagnostics over the phone and ask for diagnostic data the TV has in memory.
I have done this about 10 times and my TV usually loses all it's TV guide data after I customize my channel listings (delete all the channels I don't susbscribe to). Within a day or two of calling them, my TV Guide is back to normal.
I will never buy another LG TV. Thank God I bought the extended warranty. I've had the power supply already replaced (this is also the 2nd set..replaced 1st set due to same issue), TV turns itself on at times ( in winter - low humidity/static electricity??), and loses TV Guide listings on a frequent basis (after I change the channel map).
I have an LG LCD TV with the same problem. The solution is to go to MENU OPTIONS FACTORY RESET And select HOME rather than STORE on initial setup. Mine was set to store as it was a display model. That means that whatever picture setting you make they will reset after 10 minutes.
You might consider using Best Buy's "Geek Squad" just to make sure the set is not a dud. I'm sure if it's near to the 30 days, they would be real schmucks not to replace it. But, maybe it's just a setting somewhere in a menu. Have a good look at the manual with a beer, and I'm sure you will find something useful.
The amount of standyby power consumtion is minimal. The only way to turn it off completly is to disconnect the power from the TV. This will however increase your start up time when you want to use the TV.