iPhone X connects to WiFi, but no bars in the corner of the screen.

Hi, I have an iPhone X with a WiFi issue.

it finds WiFi networks fine, and can connect to them - but the WiFi isn’t actually functioning. There are no bars in the top right corner of the screen, and web pages won’t load.

I have swapped the WiFi antenna twice, with no luck. Is this likely to be a board issue at this point?

It’s got a replacement back case after it was dropped. Everything else seems to function fine, aside from FaceID, which was broken during disassembly.