GND Connection

 

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NOTE: 

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.

GND connection use a clip, you can connect GND any one of these

the metal fingers that hold the MEMORY 

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 ThinkPad

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 Alligator clip.

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

If you have any questions, email Joe at

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Home ] Up ] Your TP Model ] TP HM Manuals ] Other Models ] Making probes ] [ GND Connection ] Soldering to EEPROM ] 390 390E 390X ] 600 ] 600e ] 600x ] A20 A21 A22 m/p ] A30 A30p A31 A31p ] G40 G41 ] L412 ] L512 ] L520 ] R30 ] R31 ] R32 ] R40 ] R400 ] R50 and R51 ] R51e ] R52 ] R60 ] R61 R61i ] R500 ] SL410 ] SL510 ] T20 T21 T22 T23 ] T30 ] T40/p T41/p T42/p ] T400 ] T400s ] T410 ] T410S ] T420 ] T43 T43p ] T430 ] T500 ] T510 ] T520 ] T60 T60p ] T61 T61p ] W500 ] W510 W520 W530 ] X1 Carbon ] X100e ] X130e ] X200 ] X200T ] X201 Tablet ] X220 and X230 ] X30 ] X31 ] X300 ] X301 ] X40 and X41 ] X60 X60s ] X60Tablet ] X61 X61s X61t ] Z60 ] Z60m ] Z61 ] Z61m ] Z61T ]