Saud Zahoor you need to try all other inputs as well and see if you get a picture on any of those. If you do not then you have to remove the back of your TV. Look for obvious damage of the components on the board. check for leaking or domed looking capacitors. Post some images of all of your boards with your question. Use this guide [guide|21499] for that. It will allow us to see what you see. You need to pay particular attention to your power board (most likely is what drives your backlight), your T-con board and all the wiring.
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