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Try typing your model tv along with the words "trouble codes" This could be a code 22 or a 2. Sounds like a bad connection or bad component failing such as capacitor or resistor. The tv may be shutting down as protection against what it senses as a power supply failure.
a code will always read 12-normal if you just plugged the tv in. it has to try to turn on then shut itself down to log a code. Or shutdown is caused by something the tv cannot detect . Or a front panel button has failed- does the green light turn on for a second when you hit the power button on the remote? if not try unplugging the front keypad behind the speaker cover.
have you tried to access the self diagnosis feature by holding the menu and device/input buttons on the set both in together for five seconds to see if the led will blink a two digit code such as two blinks pause two blinks for a 22 error? Try that and let me know the blink code and i can assist you.
Code 22 indicates that your set is in shut down due to what is called Short Protect. The most likely cause is the Converge Ic's drawing too much current and opening one or 2 fuses. Normal repair cost varies by area and servicer. Expect 250 to 350 plus the service call. I normally do this on site.