Backlight but no image after replacing iPad digitizer

Any assistance much appreciated. My kiddo smashed up his iPad digitizer and it came off in 1000 pieces.

I put on a new one, turning off the iPad and disconnecting the battery before removing the LCD.

When I put everything back together I tested it before putting the adhesive and while the backlight comes on, there is no image.

I've reseated the LCD cable a few times (disconnecting the battery each time) and that hasn't helped. I've looked at the cable and connector with a loupe and can't see any damage to the board or bent pins. I've reset the iPad.

Any thoughts on whether this can be anything apart from a broken LCD would be much appreciated. The LCD doesn't have any visible damage.