No post in a long time, but just want to ad for anyone else having antenna problems, I want to share a link to a potentially useful cable (if you are in the UK), thanks to @Patrick1 for clarifying the type of connector. The cable pictured looks like a Female U.FL to Female U.FL (also known as a I-PEX MHF) . I am guessing the part number might be U.FL-2LP(V)-04N1-A-(35) though I think the length may be too long at 35 mm. Also just guessing here but it looks like there are two of these, attached to the center board. Either way I will give it a go and update you here.
Youāre right; I thought there were two cables connected on either side of the rectangular board in the middle.
Also , It turns out that it is not a u.fl connector but itās miniature cousin the w.fl.
Could try the 100mm cable as has been mentioned above but I donāt understand how it would work, because the length of the cable usually determines the frequencies that get picked up, unless that mysterious board in the middle has some kind of filtering function.
The only distributor that seems to sell the 80mm w.fl cables has a minimum order number of 100!
Iām going to call on @Fairphone to check if they have any spare.
Hi @UFL, thanks for asking! I managed to get three W.FL 100mm cables, I donāt remember if I bought from RS components UK or Farnell. Iād say it is worth a trym I had two phones with the issue, one from a friend, and it solved the problem with one phone but not the other. Itās fairly doable if you have done any electronics before. Donāt forget to also get a Torx T5 screwdriver if you donāt already have one.