Default [Q] Screen cracked, now have no service.

My buddy ran over his Droid Ultra Maxx with his creeper and cracked the screen. LCD and digitizer still work but it won't pick up the verizon network anymore. Opened it up and found a cut on the cellular antenna on the top so we replaced that top speaker unit. No change. Doesn't seem to be any other damage other than the screen. Is it possible something in the display assembly is shorting out?