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If your tv has a custom settings area, first turn all color down on set so picture looks black and white. Now in color settings look for red blue and green color bars. Use the bars until the picture looks as true to black and white as possible. Also, try changing color temp.
Most likely you have a fault in the back light circuit. To verify this, turn on the set, when the screen goes black, take a bright flashlight and shine it on the screen. It may be easier to dim the lights in the room so that you can see the faint image on the screen. If you see the faint image, you indeed have a back light problem. You will need to get a diagnoses performed on the set to track down the problem
This problems it is alway the problems of the board that call the T-CON decoders board it is the problems and the causes.The T-CON decoders board sit at bottom in the middle of the LCD screen panel.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish T-CON decoders board for the replacement.
When you tune to a station and get sound I presume the screen is black so do the following.
Place a bright flashlight against the screen. Look for an image around the edge of the flashlight. If you see an image the problem is probably one of three causes.
1) Power to the inverter board is bad. 2) Inverter board has failed.
3) The CCFT(cold cathode fluorescent light) are dead.
Someone knowledgeable in electronics can diagnosis it.