If the extra chip was added to the original design I wonder how hard it
would be to cut it back out again? Admittedly if this amounts to much
more than "crush it with a pair of needlenose pliers" or "place a
soldering iron on it for 20 seconds" it would be impractical and likely
not economical to repair these motherboards. Removing it with a hot air
workstation (it must be surface mounted) would likely restore the
motherboard to its original design, but doing so without damaging any of
the surrounding components on a typical tightly packed motherboard might
be very difficult.
This also suggests that manufacturers are going to have to start
carefully auditing products coming in from overseas factories to verify
that they have not diverged in unexpected ways. That is going to be
really hard because while this was actually an extra component, the
obvious next step is to add the function to an existing chip, so the
board would not appear externally to be any different. To find that
sort of change they would have to cut open the chip packages and review
the chips in an EM. And the counter measure would be to only sprinkle
in a few contaminated chips instead of installing them everywhere.
On balance this seems like an excellent reason to ban the importation of
"must be trusted" components from China. (Makes me wonder about
products from that new Foxconn plant in Wisconsin too.) For once the
Trump administration could call "national security" when implementing a
policy like that and actually have a good case.
Regards,
David Mathog
mat...@caltech.edu
Manager, Sequence Analysis Facility, Biology Division, Caltech
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