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These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. Viewing it in "Mosaic" or "Magazine" will make surf easy. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.
Open up the tv then go to where the on switch is on the bottom of the tv. After that make sure you have the metal back off and look on the circuit board near the power plug socket there should be a fuse cylindrical one. Just have to replace it same thing happened to my 42hdt50 guy i am friends with told me i needed a new one. So, thats what it might be if not then I do not know.