Why does backlight work for a second?

Does anyone have a recommendation of a place I can mail my iPad mini 2? I have the problem where my backlight works and an apple logo shows up when it’s booting up but only for 1-2 seconds and then it goes black.

I’ve tried resetting it, replacing both LCD and screen components, but I get nothing. My problem now is I don’t have anywhere to go with it since it has been opened up and there are no good places near me. Is there a reputable place you can mail your iPad?