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Sounds like the back light is out, and the unit needs servicing. You can check this by shining a flashlight close to the surface, and if some image is seen, the the back light is the cause. Else the LCD driver is gone.
Hi There are different possibilities in your case¸but what happened to me ... The LCD Backligh is out , I mean the bulbs or neons of the screen BACKLIGH, you have to check either the lights itself or the driver circuit which supply the HV to operate it, usually its a separate small long PCB beside the TV main board . You can try this trick , Keep all lights off in the room and bring a table lamp, preferred a white neon one and face it lighted on the top of the screen with the TV on , try watch a very dark but exact picture with the sound you are hearing. This is a way to be sure that it is LCD backlights problem when using an external light to illuminate the screen . It worked for me ,Good luck