WiFi signal got very weak
Hello ! Recently I had a problem with one of the sim slots and I took my phone to the service centre. I took it back, but obviously they have done something to the wifi antenna, because the signal now is very week, even right next to the router. The problem is not in the router itself. I don't want to get my phone back to the service centre, because of many reasons. I understood that the problem could be in the wifi antenna, but I don't know where it is, in order to try to at least clean it. Can you help me? Thanks!
p.s. I think it might be happening because 2 out of 4 wires are not soldered. /sorry, English is not my first language, obviously :)/
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Cleaning it will probably not help. I expect that the solder joint to the board got cracked. I can't see anything on the picture which is definitely an antenna. Maybe it's on the back side of the board. Usually they look like a bar of ceramic with a wire going through (soldered at both ends), although you can make an antenna out of any loop of wire that's the correct dimensions.
- de James Van Damme