Hardware test shows error "4SNS/1/40000000: IO0R-1.550"

Thanks for answer. I thought this was current sensor issue but then I read carefully it says IOzeroR not IzerozeroR. Which seem like I/O port issue or something. I'm just guessing here though.

And if micro soldering solution is not in my reach, would this mean a logic board replacement?

Not all the time

you could take it to apple and they will most likely tell you whats wrong and give you a quote

you can use this to your advantage as if its something silly that can be replaced with in 5-10 minutes that you are happy to do then you have saved yourself a bit of money

if it comes to a logic board replacement ( highly doubt) apple charge a fair price but you can get it worked on or buy a replacement and do it yourself