Help with Troublesome antenna issue note 10+

I tried a different SIM, albeit from same carrier and nothing. Although I felt like I saw a bar or two appear for a second. Then I tried to switch networks but it actually won't switch networks, probably because of the SIM? I feel like I should have been able to at least switch from global to lte but nope doesn't want to. I know the physical aspect of the antenna is woven throughout the frame and there is no physical damage there so idk. I am stumped on this one.

@mikejoyce41293

Is the phone locked to a carrier? That might be why a different SIM won't work.

Perhaps carefully inspect the board shown on p.3 of the manual especially around the U15xx and F15xx components as they're the ones associated with signal reception and transmission

It's unlocked phone on Verizon. I'm thinking it's definitely on the board, possibly at the cable connection from SUB ribbon. It's weird because this happened on a previous phone as well and changing charging port board fixed it for a while then it ended up being spotty as well. Must be common thing on these phones but there isn't a lot of TSB's on this really. Now there is absolutely no signal. I'm guessing broken solder joint on motherboard at that SUB connection. I can get a used Motherboard cheap but don't want to add too much into the repair. I'm going to look there and will update what I find.