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Re: red light blinks 4 times
That sounds like a fault code coming from your Plasma. Some of them have alarms that go off when say it's overheating, Fans don't turn, the panel has sensed a crack in it. These are random as I don't have the fault code for that particular model. There is a reset sequence of buttons while you turn it on to reset the alarm. I would contact the manufacturer. to see what those fault codes mean. If something minor you can do the reset alarm and watch for a short 2-3 hrs. but will need to be taken in to be serviced. If you can reset it and turns on then you know your power supply is good.
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Does the front light stays green ? Or goes back to red ? The back-light going on/off maybe the problem, but it shoul return with a red blinking led (4 times ?) and if so it can be a power inverter problem.
Dont know if this will work for you or not, but my brother gave me his because of the same problem. It would power up and a green light would come on, then after 10 -15 seconds it would change to a red blinking light. I plugged a usb cable into the service port on the side and left the other end unplugged. Then plugged the tv back into the power. i took a small screwdriver and ran across the contacts in the end of the usb cable until both the red light and the green lights came on. I did this several times listening fot the clicking noises in the TV. after doing this for approx 20 seconds, i pressed the power button and the TV worked fine. 5 days now and no problems. Only thing I can think is I somehow reset the software and now it is working fine. Hope some of you can figure this out and give it a try. if the TV is just sitting, you have nothing to lose