Brand new screen doesn't turn on after replacement

[erinspice]

Hello! I just replaced my LCD+digitizer assembly. When I turn my tablet back on, I can hear sounds, but the screen stays black.

I'm currently charging the battery (which had died), but I am planning on shutting it down and checking all my connections in an hour or so. Is there anything else I can test or try to get this new screen to work?

I also can't find a simple demonstration of this being done. Every other video or tutorial I can find is a different model or is only replacing the digitizer or is a complete disassembly. I'd be grateful for a suggestion of a demostration of replacement of the LCD+digitizer.

 

[Beut]

The LCD cable connected to 2 connectors: one from mainboard, other from LCD. The white line on cable should be aligned with the line on board, if it is not fully seated, your LCD will have a black screen. Try to disconnect and reconnect it again, then cover the connector with a tape to prevent the claim pop up.
In this picture, the LCD cable is on the left