If your KeyMaker is actually
powered by the USB cable connected to the LOCKED ThinkPad then the GND
connection has already been made by the USB Cable so you do not need a
separate GND connection.
If your KeyMaker is
powered by another PC or Laptop [not the locked ThinkPad] then you must use
the GND connection from the KeyMaker I2C connector and cable.
connection use a clip, you can connect GND any one of these
the metal fingers that hold the
or any of the large metal covers
or the metal attached to the FAN
or any of the Screws on external connectors
like the screws holes on each side of the Video connector.
or the metal fingers that hold the Memory
modules in place
Or the metal frame of the USB connector on the
See my page on Options
for Clips and Probes including making your own probes.
I receive many emails asking about the GND
connection, in reality it is very simple, you use some kind of a clip so that
you don't have to hold it in place, you DON'T HAVE 3 HANDS and there are 3
connections, GND SDA and SCL, so have a clip for GND, then you can use the 2
hands YOU DO HAVE to hold your SDA and SCL probes in place.
In the photos below I show an Ezi-hook and an
If you are using a Large Alligator clip like
the one in the photos below, you must make sure the large bare metal of the
Alligator clip does not make contact with something other than the metal piece
you are connecting to.
Almost any large piece of metal or the screws
for the external connectors of any ThinkPad are a good GND connecting point.
Anyway a picture is worth a thousand words,
examples of GND connections.