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Television will not power on?

When I try to turn my panasonic telivision on,the green power indicator light illuminates,then blinks,then instead of the screen powering on it makes a buzzing noise for about 3 seconds then stops,and still no visual and no sound. My T.V. was built in june 2006 and is 52 inches with a multi-media projection display;model#PT-52LCX16

Could you please tell me the possible malfunction and how to fix/replace? Thank You!!!

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TV's use high voltage to generate the stream of electrons traveling across the picture tube hitting the screen and lighting it up (thus the name Cathode Ray Tube). It takes about 25,000 volts to do this. In normal air, it takes about 1000 volts to jump an inch of air, so the high voltage transformer needs to have good insulation. It generates the voltage through a technique of charging the transformer's magnetic field with a low voltage of about 140 volts then letting it go where upon it flys back out the high voltage side at much high levels (Thus the common name flyback). A most common failure in a CRT type TV is for the insulation to crack in this transformer which is a unique component for each model of TV and leak out the current overstressing the circuit driving it. You can liken it to a little bolt of lightning getting loose in the circuit and has the same sound on a smaller scale.
It would be well to replace your flyback transformer before it gets worse and blows up something else as well. Best done by a professional used to handling high voltage. The picture tube can retain voltage even when the TV is unplugged for some time, and replacing the anode lead (the big red one) can be dangerous.
Hope Ya Fix It!

Posted on Mar 05, 2008

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