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You need to change the four capacitors C9B01,C9B02,C9B10,C9B11 all 1000 MFD 16 VOLT (on the DM board which is inside the metal shield standing upright on the left looking from the back of the set)The tops of the capacitors will look puffed out making them easy to find. This is your HD tuner digital board which is trying to reboot but can't - when the green light stops blinking after a minute,than you can power on your TV.
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Unplug the unit for 5 minutes then plug it again. Turn it on. If it
does not power up, press the SYSTEM RESET button on the front panel
with a pointed object such as the point of a pencil or end tip of a
paper clip. The green LED light will flash quickly for about a minute
then stops. You may turn on the TV then. The changes you made most
recently, before using SYSTEM RESET, may be lost. Changes you made previously, however, are not lost.
The constant blinking green light means that the TV is not booting up. This is a common problem on this set.You need to remove the shield from the DM board (standing upright on the left where the DTV RF connector is)and inside you will see the four leaky capacitors (1000 MFD 16 VOLT)replace them,plug the TV in and wait 70 seconds for the blinking light to stop,then turn on the TV.The hard part will be removing the board from the TV(lots of screws and connectors,takes time)
I had the same problem. Unplugged it, reset it, everything. I went to work the next morning and left the light blinking, came home from work and it was off. I turned it on and so far, so good. Just give it some time to reset internally