Display dont working after change

Hi all, im changed charging flat usb-c cable without problem and before im put new screen adhesive back im turn my device on and check everything and was all functions good and working well, but after, im forget turn device off and im disconect my lcd when was device on, then im put new adhesive, put display back and close phone and now phone is still on, i can hear when is some message comming, charging diode working, vibration too but display is black… So my phone cant see this display or dont know, So please help , thanks .