Lose picture few seconds after turning on set
Turn on set, have picture for few seconds, and then screen goes blank
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Is there still audio heard when the TV screen goes blank?
If so, try shining a flashlight at an angle close to the screen and check if you can see any images at all. They will be very faint if they are there so trying this in a darkened room may help.
If you can see images then there is a problem with either the CCFL backlight tube (Cold Cathode Fluorescent) or the CCFL inverter (power supply for the tube.
Here's a video that shows what's involved in replacing the CCFL tube (if this is the problem) in a Samsung TV, that may help..
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