Locate the Tv POWER cord, unplug it from the wall outlet, wait three full minutes, then plug it back in. Now test if you have picture or if you can see the Tv menu using the Tv remote.
If the power reset didn't help then the Tv has a failure and will need to be opened up, diagnosed, and parts replaced. There is absolutely no way to guess what is wrong, it must be opened up and diagnosed. If you want to attempt a DIY repair then I can help you but there are no guarantees. REPLY here when you have taken the back off the Tv and are ready to begin.
If you cannot do this type of repair then you can find a local repair shop by entering your info here:Find you local repair shop
Sorry there is no easy fix, at least you are now informed of your choices. Keep in mind that the information I just gave you normally costs $99-$129 from a repair shop (and they will never give you the DIY option).
Now please take a moment to leave a positive rating. Your question does not close when you rate and remember I am here to provide you with excellent service so if you need more help then REPLY here.
You are rating my advice and information NOT how this site works or how your device functions. Again, if you want more information then use the REPLY button (note that a negative rating does not issue a refund).