Are the small threaded holes on the logic board serving any function?
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Do the small threaded holes on the logic board that are used to secure the protective plates that go over all of the electrical connections have any other fuction other than to hold the plates down? Is there going to be a problem if one becomes disconnected from the logic board, say the inside corner of the board for example. I have one that fell off during reassembly and I want to verify that this is not going to be a problem. How can you fix this?
I too had the problem, that the thread (tutorial ' Display Assembly ', Step 13, yellow screw) separated from the logic board. Actually I think it was broken off when I opend the phone (crshed display due to droping). You can see this here: position and removed screw and thread:
I decided to assemble the phone without this screw and thread. Up to now I did not have any abnormalities (well, I had the proximity sensor not working problem, but I think this is not related).
As an electrical engineer I consider it at least as very uncommon to use a shield or antenna as a conductor at the same time. Reasons against are: 1) bad testability of the board while not integrated into handy 2) the use of a screw is not as reliable as a soldered connection. But of course there remains a chance they do it anyhow, as space is really crucial inside such a device!
If the shield really has a jumper function at the same time: What kind of malfunction have you found in devices without this screw?