Could be the back lighting in the screen has gone out. You probably need a error code to properly diagnose it.
SOURCE: Samsung LCD TV HCP4363WX/XAA Black screen no sound.
check out the link below ... sounds like a similar problem:
http://www.dslreports.com/forum/r20889230-Samsung-LCD-TV-No-Picture-but-has-Sound
SOURCE: Philips 30PF9946
1 step can confirm if you can fix this. Press menu. If you can get a menu its fixable if you cant its in need of major repair.
SOURCE: sound yes, but no picture on tv
If you have sound on the stations this is a problem in the display. Take bright flashlight and hold it against the screen. Look for an image around the edge of the flashlight. If you see an image then it's one of three problems;
1) The inverter board is bad.
2) The CCFT (cold cathode fluoresent light) are bad.
3) The power supply to the inverter board is bad.
Someone knowledgeable in electronics can replace the bad part(s).
SOURCE: samsung lcd TV five years old, screen suddenly went black
In order to properly provide you with guidance, we need some hint about the problem. Can you describe the symptoms? Is the set dead? Are there any blinking status lights?
Thanks,
Dan
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