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I have a magnavox42mf439bf7 tv the tv wont light or sound i have change the power supply but the only thing it does is the green led flashes 15 to 20 times no pic no sound

\015 I have changed the power supply and the tv still dead no pic no sound when push power you hear a click the green led flashes 15 to 20 times and thats it\015

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