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Safety Precautions to ensure that your KeyMaker Board and ThinkPad are not damaged

In order to avoid damage to your KeyMaker Board as well as the ThinkPad you are using it on, there are certain precautions you MUST observe.

If you ignore these precautions you will join the 3% of customers who bought a KeyMaker board - ignored these precautions and damaged their KeyMaker Board  by being careless - then had to pay to have it replaced - and lost a lot of time in the process.

Your KeyMaker has electrical contacts on both sides, you must ensure that no part of your KeyMaker USB board comes into contact with any conductive surfaces such as bare metal or bare wires.

You should place down a piece of paper and place your KeyMaker USB on top of it in order to avoid any electrical contact which may damage your KeyMaker.

There is no danger of receiving an electrical shock from your KeyMaker USB as the highest voltage anywhere on the board is 5 Volts which is a safe voltage to touch.

If you prefer you can place your KeyMaker USB board inside an Anti-Static  plastic bag during use, the board does not get warm at all, so there is no issue with ventilation.

The same precautions apply to your ThinkPad when you are performing any operation and BEFORE your ThinkPad is switched ON, you must ensure that nothing can short out by coming into contact with other parts, you can use sheets of plastic or plain paper to make sure things remain electrically isolated.

You MUST NOT allow the SDA and SCL leads from any KeyMaker KMX1 or KMX2 to come into contact with ANYTHING other than the correct SDA and SDA EEPROM connections points and ONLY AFTER;

You have traced the wire you are using for your probe right back to the label on the I2C header on the KeyMaker board which reads SDA for YOUR SDA lead and reads SCL for YOUR SCL lead.

You have absolutely confirmed that you have correctly identified the SDA and SCL connection points on your ThinkPad System Board.

3% of customers who purchased a KeyMaker Board have somehow managed to damaged their KeyMaker board.

NOT ONE of those customers can tell me exactly what he or she did to damage it.

I have tried all sorts of seriously ridiculous ways to damage a KeyMaker board and I have NOT BEEN ABLE TO DAMAGE ONE !

I only tried MILDLY STUPID THINGS like connecting a solid 9 Volt source to SDA and SCL - theoretically that should have damaged the I/O pin on that KeyMaker powered from 3.3 Volts, IT DIDN'T.

Your KeyMaker board is a delicate piece of equipment, treat it with respect.

Do NOT experiment or connect to anything if you are not certain you have the correct connection points identified.

There are voltages much higher than 3.3 Volts inside your ThinkPad, in fact up to 20 Volts. 

20 Volts is not a danger to YOU but it is to the KeyMaker KMX1 or KMX2.

Connect SDA and SCL leads ONLY if you have double checked and are CERTAIN you have correctly identified SDA and SCL connection points

The above is VERY IMPORTANT - don't ignore it else you WILL damage your KeyMaker KMX1 or KMX2 board and that is expensive, wastes a lot of time and is not much fun.

Read more on Safety Precautions here

Joe's KeyMaker KMX2 board I2C connector I/O pins Diagnostic

Hopefully you will not need to use this, however if you suspect your KMX2 board's I/O has been damaged, this will reassure you that it is not or confirm your worst fears.

The KMX2 I2C interface I/O pins can be protected if you want the freedom to make serious mistakes.. Read More on Protection.

Access to KMX2 Diagnostic is from the Main Menu, Command 7 Diagnostic

Type command 7

Type command 1

Before typing Y - disconnect all cables from the KMX2 I2C connector.

When you are ready to conduct the test - type in Y for yes

the test can result in PASSED which confirms that the I2C interface on that KMX2 is working correctly and is NOT damaged.

or FAILED, if the diagnostic test fails you should check that all cables are in fact disconnected and test again if any cables had been connected during the test

If the Diagnostic test returns FAILED and you are absolutely certain that you disconnected all cables from the KMX2 I2C interface before conducting the Diagnostic test, that confirms that your KMX1 board has been damaged. Follow the displayed instructions to have your board replaced.

Read the page for Replacing damaged KeyMaker board

The KMX2 I2c interface IO pins can be protected if you want the freedom to make serious mistakes.. Read More on Protection.


I make no warranty that any of my information is correct, or safe, or does or does not breach any warranty clause,  or anything else, it is up to you to decide if you will follow all or any of the instructions to recover the Supervisor Password from a TP. It is up to you to decide, I am not responsible for the results or for any consequential or incidental damages whatsoever.

Up Activate KMX2 Activate KMX2 PRO Activate KMX2PROPLUS KMX2 unlocks TP KMX2 Zap KMX2+KMX-LCD KMX2+PC 93C46 Connections Save EEPROM Write EEPROM Diagnostic

If you have any questions, email Joe at

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