Buddy of mine shows up with a car running terible, could not get out of itsown way. He had taken it to Mr. Goodwrench and they ran the computer on it, the big one, not just the easy method. After scratching their heads for hours and charging him a diagnostic, they told him it needed a new engine.
I took a look at it and I had to scratch my head a bit as well. See the book said it did not have a timing chain, it supposedly had gears. Finally I told him to tear down for timing chain and guess what. He stopped by later with the pieces of what used to be the CHAIN tensioner.
Some sources say that code if for a short. Well there is a problem with that theory. They detect a short by one of the sources going low, not by actually monitoring the current. So you can't know if the problem is a short or a fualt of some other type in the power supply.
I have had two exact same model numbers of TVs be completely different inside. It is more likely this in serial number up to X, but after that is morelikely that in the later sets. There is no substitute for actual troubleshooting, using the service AID - the trouble code(s). They do not actually diagnose themselves.
If you insist on fixing it yourself, replace the cheapest board first and move on up in price until you hit the right one.