Chosen Solution

Hi guys. I have iphone 7+, it was working so good. Then suddenly, one day it went off. And it didn’t turn on again. When i tried to force start it, it still doesn’t work. So when i put it on charge, it lights up black with nothing on the screen. And it just shows black like that as long as it’s still on charge when its removed, it goes off the black screen. Sometimes it shows apple logo then shows black lighting again. What would the problem be guys?

Power ic or battery needs replaced or needs new charge port.