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Sounds like screen voltage has exceeded much. Its LOT adjustments should be checked. Contact any service technician.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
The Lamp it self, the Ballast, or the Power Supply that powers the Ballast. Even a combination of the Lamp and Power Supply is a common problem. If you have not replaced the Lamp since you have owned the set I would replace that first. The Lamp has about a 3000 to 5000 hour life span.
Hope this helps,
Are you really sure , your set has video? How dark is it ? As if really nothing visible? Am, sure you can hear sounds. You can adjust the brightness + button to increase the brightness. But if nothing happens , you have problem with your TV set. The problem might be in the Video section. Please let an expert technician to check it. Please don't do it by yourself, it's risky.
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