Unable to turn on after replace Screen

Hi! I just changed my screen for my POCOFONE F1 and after assembled everything the device cannot switch On. I’ve tried to check if there’s any disconnected cable inside the device. All were connected. I’ve tried to Force Boot where you need to press Volume Down + Power Button for 15 seconds and longer, but still won’t turn on.. Tried while charging to wall socket too, still cannot turn on the device. If anyone can help me, please reply to my question. I really appreciate your help. Thank you.