You did something wrong - broke the digitizer, broke a wire, broke a connector, burned out a driver pin on thw motherboard - something.
The only advice I ever give in physically repairing your own phone (unless you're a cellphone repair tech) is DON'T. It's too late for that now. Don't break something else. Bring it to a shop and pay them to fix it, or you'll end up breaking something else when you try to find out what you broke this time. When you fix that you'll break something else. Eventually you'll pay a lot more than a new phone costs.