TV DOES NOT TURN ON

I would say the power supply is not working. May be something as simple as a fuse. To check the fuses, a person must always to first, unplug the set from the wall. Then take the screws/1/4" nuts from the bottom back panel of the set. You should be able to take a flashlight and observe any bad fuses, or better yet, if you have a continunity checker ( vom/dvm ) use that to check each fuse. There are usally more than one in a big screen. Good luck. I hope this has helped.
Ed
NC Electronics
Mills, Wyoming

Crack open the back you might notice that inside the unit, it's caked with dust. Dust will kill any electronic device. You might be lucky and catch the problem before it fries your board. But more than likely its done. Look and listen for any burning or smoke within the unit. I had the same prob and was able to catch the offending device and replaced it. (RCA D52W21)