I got my A52 5G repaired by Samsung because of a dead display (after 3 months and no physical damage), and after receiving it I noticed that the phone can't find any 5ghz wifi network, unless I am standing about 30 cm from the router (and still it disconnects). I tried with multiple networks (home, office, friends, etc), changing channels and rebooting both router and phone, and still nothing. My old A5 and my wife's Pixel 5 phone are getting a strong 5ghz signal anywhere in the house.
What can be the cause since before sending it for repair, I could connect to any 5ghz network without any problem, even from a long range? Its as if they removed or broke an antenna
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Those tiny connections can be finicky to reconnect, but the person doing the repair should have tested a bunch of stuff after the repair like the camera and wireless connections because those usually need to be disconnected to replace the screen (depending on the phone model).