From my research: Turn down the backlight if you want to prolong the life of you TV. If the top of the set feels hot, it is probably not doing the set any good.

We have a 50" Toshiba LED TV less than 3 years old, did not purchase extended warranty as usual with electronics. Three weeks ago, screen went dark, sound still on... can change channels, volume. Can see a faint image in a dark room with a flashlight. I knew immediately it was either burned out backlight LED's or power supply board. Did some googling and was not able to find a schematic/ service manual. Toshiba was no help since it is out of warranty. Found the LED's for this particular set is not available anywhere. Found a power supply board for $65 in Hong Kong, nothing closer. Didn't order the power supply since I am not sure if the LED's are ok or not. If not, no use buying power supply board. Opened up the set which was a pain. Bezel and back cover is snapped together with opposing snaps that is not intuitive to unfasten.

Poked around with an ohm meter in the power supply board and found 3 components shorted out (2 Schottky diodes and 1 Mosfet). Got the faint p/n's (thank God they were legible) and ordered equivalents (exact p/n not available) with higher ratings from China. Parts arrived in 2 weeks, not bad less than $10 for 3 Mosfets 10 diodes. Put the parts in and got a bright screen!. Set works again!

I was very surprised the TV burned out so early, our first big screen LED TV purchase.

Go into settings/ backlight and turn it down as far down as you can and still see a good picture so that your set may live longer.

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