Faint Apple Logo Followed by Black Screen

This iPad Mini came in for a digitizer replacement. I went through the repair process as I have always done. Before sealing the unit, I turned it on to test. The device sits at the Apple logo, which is faint as if the back light was bad. This screen seems to be visible for slightly longer than normal and then abruptly disappears. At that point, the iPad screen won't wake up in response to the power or home buttons. When connected to power, the iPad dings indicating that it is on. Plugging the device into a PC brings up iTunes which recognizes the tablet. Disconnecting and reconnecting the battery for another attempt to boot up provides the same results.

I have tried multiple LCDs and replaced the back light filter just to be safe.

Please don't hesitate to give advice, even if it is only a suggestion.

Thanks