Hi Jaiden,
If it is indeed the backlight there will still be a picture but it won't be visible under normal lighting. If you take a flashlight and put it up to the screen at an angle you should be able to see something on the screen.
Do you have a dock? If the TV screen works when docked, then yeah, you're almost certainly looking at a display replacement.
So check those things out then come on back and let us know what you found.