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Sounds like you have a backlight problem. To verify this, turn on the set, dim the lights in the room, and shine a bright flashlight on the screen. If you see a faint picture you have a backlight fault. It could be as simple as a bad capacitor in the power supply, or a faulty inverter board, or in rare cases a bad backlamp.
Hello You haven't either given its Brand name or its Model number. Anyway, as it is an LCD TV, this is common fault to all brands. Check its backlight CCFL tubes, and the backlight inverter board. Actually there is picture, but you cant see it as there is no backlight. OK.
Hello There are so many reasons for picture to gets out. The first amoung them, is of its backlight itself. If the backlight CCFL tubes wont light up, there will be no backlight to illuminate the picture. If baclkight inverter board has damaged, backlight CCFL lamps won't light up. The most common fault with LCD TVs are backlight failure itself. The second one is of with its main video processor board. In short, main board itself. You have to check and make sure which one is faulty. You must ahve sound knoledge in electronics to proceed. OK.
There will be a problem with the backlights not being switched on, you would need to check if you are getting the supply voltage to the Inverter board (24V). If not check the power supply, if it is present then check if the backlights are functioning with a backlight tester, if these are ok check the capacitors on the inverter board. If the backlights are faulty then a replacement screen would be required.