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Turn the TV off and unplug it from the wall and also unplug everything that is connected to your TV for about 1 minute and plug everything back in again. There could some thing wrong with the power supply or a problem with the t conn board here.
When the picture is dark, show a torch light on the screen from a safe distance. If you can see the picture, the backlight is the problem. Anyhow, it is better to show it to a qualified service technician.
You could have a faulty inverter board or faulty CCFL lamp which can cause the screen to flash. Check out LCD Parts for service, parts and DIY info - click on this link to their WEB site. :- www.lcdparts.net
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