It had a bad fuse. We replaced it and it immediately blew when we turned it on. I don't think it is the power inverter board as it doesn't turn on at all. Could it be the rectifier diode? Can it be tested?
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Since you've already replaced the power cord and still the led light won't came on, this is an indication that the power supply board of your unit is dead. If it is not under warranty period(if so, avail it because the manufacturer will fix it for free) open the back cover and check the continuity of the fuse using the multimeter, if you found it open replaced it with the same current(ampere) ratings and then try to turn on the TV. If the replacement fuse blew again, this is an indication of more serious problem on that board. If the replacement fuse didn't resolve the issue, other parts on that board gone to malfunction as well. If this is the case, I would advice you to replaced the entire board for your convenient. The cost will almost the same rather than troubleshoot it. Check the actual part no of your board and check this LINK.
I just repaired this identical problem on the same model TV. You have a bad power supply (also known as an SMPS). The board is model FSP271-4F02, and is about $75. Unlike the main board for this TV, you can find the power board relatively easily. Try shopjimmy, for example. Replacing the board isn't too difficult if you have a reasonable mechanical ability, have some tools, and are careful.
There is something wrong inside that is causing the fuse to blow. The fuse is the first defense in protecting the rest of the TV. The internal voltage regulator could be bad which is causing the internal power adapter to send too much voltage and current to the rest of the tv. The fuse responds to current going through it than what it is rated for.
With that in mind be sure to not stick in a bigger fuse as it could cause the tv to work for a while until something else gets damaged or the tv smokes.
Mine had the same problem. You simply remove the dozen or so screws on the back and pop the back off. If you follow where the power cord goes into the tv and trace the wires you will see a small fuse. I believe it was a 5amp and cost less than a buck. I'm not sure why mine blew but I have had no issues since.
Facing the back of television, if it occured while putting top right screw, that is because, you screw touched power module casing and the fuse inside the TV is gone. All you need to do is goto radio shack or any local store and get a replacement fuse (250v x 5 Amp) and replace it. It may cost you less than 2 bucks.
TV powers off and never turns on.
May even power in that room or house may have been tripped.
lay the TV face down on the floor.
Remove the screwes ( may be 10 - 15 screws)
Remove rear casing of the TV. It is single casing covering entire rear face of the TV.
Fuse is visibe as soon as you remove the casing.
Replace the fuse.
Put the casing back.
Start enjoying the TV.
Do not use longer screwes to mount monitor brackets on TV casing.