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Based on the information that you've provided, it seems that there is no power supply to the TV.
The Power cable or the power circuit board may be damaged.
The Power outlet may be damaged.
Also, you may try connecting to a different wall outlet to confirm if the issue is with wall outlet.
If that doesn't help then may be Service is required.
You may use the below details to schedule a service. Customer Service / Technical Support
1-888-636-8599 Toll-Free Customer Service
You have a bad capacitor or two in the lighting of your LCD screen. I have not worked on this particular unit. I have had a smaller version of this TV. On the smaller version there were two capacitors in the power supply. The transformer that lights the LCD panel ,yes, is in the power supply.There were two of them and I think the values were 35 volts at 1000Mfs. I hope this will clue you into a fix. Yes, I really think you have a couple of bad capacitors. If you pull this TV apart, by all means inspect all the capacitors in the signal board (has the RF connections and all your RCA connections). You will find several bad capacitors by now. I do repair TVs, so this is good advice for repair. Thanks for asking and show all hands of support!l
Since the tv is not turning on try unplugging it from the wall outlet for a few minutes. Up to 10 or 15 and see if the set will reset on it's own. If that does not work press the power button and when the front light comes on press and hold power button for about 10 seconds to see if it will reset this way. Maybe this work.