"My phone won't charge sometimes."に関する回答It most likely isn’t charging because of dirt in the port. If you clear out dirt and it still doesn’t charge, it could be your charger. You could also take it to the store you got it from and talk to them about it.
"Black Screen after LCD replacement"に関する回答You should try seeing if any connections are loose and or broken. There could be a small piece in the connector broken when you replaced it.