Boot issues after screen/digitizer replacement

I just replaced the glass/lcd/digitizer with a full kit from iFixit. I also replaced the battery and loudspeaker. The unit was a refurb from AT&T and the battery was glued in, not tabs to pull, so that took heat and prying from the left. I did the screen unit last.

After replacing everything and checking connections, the phone would boot to an Apple logo and get stuck or flash between the logo and a red screen.

After taking it apart, I discovered that with the front camera connector off, it will boot into the OS just fine.

This is a unit from iFixit so it is under warranty, I just wonder if there is anything to try before asking for an RMA.

Ideas?