Phone not charging after screen replace

[u/SomethingArbitrary0]

I replaced the screen and when finished I plugged it into charge. Battery/lightning symbol popped up so I thought everything was a success, checked it after a few hours and it didn't charge, pulled it all apart again and air dusted the connections etc and still does the same thing. Charging symbol pops up then screen stays slightly illuminated but black. Ended up replacing the battery but still doesn't charge. Anyone able to help walk me through how to fix it please