TV has no power after power cut

If there is no influence, let it continue like this.
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Stephanie, TV will have to come apart to check for bad capacitors,etc. on the internal board.
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Sounds strange indeed. All other devices; except the TV works fine with all power sockets at your house!! Just replace the power pin, at the end of the TV power cord and check. There is nothing more to check for you. It it too do not help you, contact any service technician. Electro help

Did you try to use button on TV to turn on? Maybe remote battery bad?

Almost all tv's have an "always on" circuit. You must be cutting off the power from the wall (A\C). Do you have the TV connected to ON\OFF POWER SWITCH that you TURN OFF when TV is not in use.? Connect the A\C plug directly to wall socket.

Double check your work and make sure everything is back like it was before you took it apart

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I would have to say that you have bad capacitor in the power supply.Have you taken the TV apart?If you can take it apart,and send some pictures of the board with the power cord going to it,I can tell you which capacitors if any are bad.They have a rounded top to them instead of being flat.Also,how many blinks does the power light blink?Usually it's a series of flashes,and then it repeats.I hope this helps.Thank You very much!
Tyler

I believe that your TV's had a bad soldering. resoldering all the circuits may help.

if you bang or tap the top or side of your TV the video, sound, or anything will move or something happen.

warning: TV's has a high voltage. I prefer you to be careful if you open it.
have a good day and take care.

I bought a LG 39" flat screen 6 months ago. TV has been working great until this morning. Power comes on for about 5 seconds and then cuts off. Have checked all connections and have unplugged from wall to reset, NOTHING!! And a brand new TV!! Any help would be great!