So my Ipad Air 2 has been dropped before, and the screen goes out, but siri and the sounds work and touchscreen works, so before I just power off and turn on then it worked. But right now the same scenario ipad screen blacked out again but when I turn off and on, it doesnt have light anymore, but using a flashlight, I can see the shadow of the apple logo coming out of the screen. What do you think is the problem, i researched it and said it was backlight issue, and do I need to replace whole LCD?