Sceptre X42GV-Naga 42 in. LCD Television Logo

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No picture, no sound

I was watching my t.v. and all of a sudden I had no picture, and had sound for short time. then now I have no sound or picture

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Sony LCD 52 inch

This sound like you are having problems with the power supply board. Since you are getting a momentary picture and sound the fuses are good but TVs today have "shorts" and "overvoltage" circuitry build in that will shut it down on errors. Someone knowledgeable in electronics will have to isolate the exact cause.
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sony has problem with bad picture tubes as well as flyback transformers .if you have shorted hori output then replace it if set shorts it out again your looking at bad flyback transformer as well as maybe leaky tube.
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Something shorted and shut your set down. Most likely the high voltage transformer shorted which also shorted the horizontal output transistor. Stargazer
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