2 year old TV would not power up one day, after doing online research I found out that it could be the a blown internal fuse $.99, or the power board, around $70 on Ebay. Fortunately in my case it was the fuse (ft8ah250vp) that gave up, and after an hour of work, I had it up and running.
Step 1 - Remove all 42 screws from back cover. Remove top center screw last, it will help to hold the panel in place during removal of other screws.
There are 5 fuses total, make sure to remove them from the holder and check for continuity with a multimeter.
If all test Ok, you might need to have the Power board replaced.
That's the one that I found faulty. Just Remove it with a pair of needle-nose pliers and replace with a new one (ft8ah250vp).
TV up and running... and the best part was that it only cost me less than a dollar to get it repaired!!!!