If there is no power LED lights up at its front panel, it indicates that the main power supply regulator board inside the TV has the fault. It do not works at all, or it do not get the AC mains power into it to work.
If the power LED at its front panel is lit, and the set do not power up by pressing the power button at the remote control; it is the symptom of a faulty main board.
Fault to the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
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