We were recently brought a phone that had this error made during reassembly and took it under a microscope to see what could be done to repair it. Here are a few photos with captions detailing what we found.
After desoldering the screw nut from the board, the outlook is not
pretty. For reference, the dark circle inside the shiny ring is 1mm.
After cleaning the surface it is easy to see the circular cut in the board made by the too long screw.
As we begin to remove the top layer of the circuit board you can just
start to see one of the 7 traces that runs through that circle
A few more traces start to emerge as the board removal continues. The
width of these copper traces is 50 microns (a little narrower than a
human hair.)
We stop removing board material at this point (hence the dark spot in
the middle of the circle) because we had uncovered all the traces that
were damaged.
Needless to say this is a repair that requires the right equipment and
significant board level repair experience. If you made this mistake
yourself or took your phone to a shop that made this mistake and damaged
your phone please send us a message or give us a call and we would be
glad to help get your phone back up and running.
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