Try resoldering the parts at the power supply section and check also connectors make sure that there are no loose connectors.press down fuses make sure it have contact on the board If you have a multimeter measure the continuity of the power cord replace the cord.if it has an internal cut.
Try this steps first and let me hear how it goes...good luck!
If you find your television does not power up properly, you need to troubleshoot the problem. The exact reason may vary, and hopefully you are able to correct the problem. (If the TV has shorted due to an electrical surge, you can't do anything about it).
Press the power button on the TV and not the remote control. It is possible the remote control's batteries are dead. If the TV does turn on, you know you need to replace the remote's batteries.
Disconnect the power cable from the TV, then insert it into a different electrical outlet. On occasion outlets are damaged, and do not provide a power current. If this is the case, changing the electrical outlet connection corrects the problem.
Switch the television's input to a different connection. It may be possible you have the wrong input selected, causing the TV to give off a black screen.
Connect a different source device (such as a DVD player or cable receiver) to the television. If the source equipment is damaged, you will not receive an image from the hardware. If the TV still does not display an image, there is an electrical shortage in the interior of the TV. To see if there is any way to fix this issue, you need to take it into a local TV repair shop.
Also it could be just a few bad capacitors on the power supply, if you want to attempt the repair yourself you can do a visual of the power board caps will appear swollen on to.
It is not recommended that do it yourself, but depending on your knowledge and technical ability you may be able to. With the back removed you will usually see two circuit boards the upper one is the power supply, it has a few capacitors on it (cylindrical standing straight up soldered in mark on the sides with the positive/negative sides and MF and Volts values) usually I replace about four of them (or all the bulged on top ones) .
The power board and back unscrew with a medium Philips screwdriver, if you do not know how to desolder and resolder then do not attempt this as you may damage the TV more than fix it.
Also check this link to troubleshoot your problem,if it helps:-
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