Product review (4 stars): Quick and easy power supply swap - fear not, do it yourself!
There have been many comments about bad power supplies on LG and Samsung LCD and LED TVs.  When my set started exhibiting trouble, I took out the power supply board and inspected the capacitors, expecting to find one that was blown and I would have made a change out.  None of them seemed damaged, so I determined that the value of my time was worth more than the cost of a replacement board.  I installed this item in a matter of ten minutes and the set works perfectly.  If you are afraid of touching your TV, there is no reason to be so.  These days, there are only two large boards behind the back panel and they wire up with quick disconnects, no soldering required.  The cost of BOTH boards on Amazon is usually less than the cost of diagnosing the problem at a repair facility, so if you are unsure what the problem is, just order both and change them yourself.