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I would try a power drain: Unplug the TV's power cable so the TV is not grounded to the house. Then press and hold in the TV's own power button for one minute to drain the capacitors. Plug the TV back in and see what happens. If the TV will still not turn on, I would say you have a problem with the TV's mainboard as a dead power supply will not light any LED's for you.
Same problem with mine. Relays click, sound, no picture and a flashing power LED. I finally found a schematic online. I went through the high voltage circuits and found the power transistor 2SC5570 was shorted out. There is also a pico fuse in that area but my was not open. I replaced the transistor and prayed the flyback transformer was not shorted. It wasn't, I'm watching my old 36" right now. Not a bad fix (17.00) bucks. Wonder what a service tech would have charged ;)
For the first one, please list the model number and count the blinks. Also, can you please post each problem separately. It will get too confusing trying to address 3 sets with different but similar problems.
your problem is a more technical problem you will need a tech to look at your set if you are not a tech you wont be able to do it your self. contact a tech to repair your set the problem is in the power supply or related circuit.good luck.