Why won't my TV turn on?

@niksalay sounds like an issue with your power board. You did try to turn it on with some buttons and not just your remote. I am also sure that you tried all different video inputs and disconnected any accessory like cable box, surround sound set etc. before testing anything. Unplug your set and remove the back. then take a close look at the power board. Do not touch anything yet since the caps may still be charged. Check for leaking, bulging or domed looking capacitors or any other obviously damaged parts. Post some images of your boards with your question so we can see what you see. Use this guide for that. You also want to make sure that you have a multimeter to check the fuses on the board for continuity.