T20 T21 T22 T23

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Please visit the Home page for new developments

Instructions on how to actually unlock your ThinkPad (TP) are in the User's Guides

EEPROM Location and Type

T20 T21 T22 T23 EEPROM you treat it as a 24RF08

Locating the T20 series connection points

Switch the T20 OFF.

You should have already downloaded the hardware Maintenance Manual for your ThinkPad model, if you have not done so use the link below to download it now,

Download the Hardware Maintenance Manual (HMM) for your TP model

The links above are to the Lenovo site, if it doesn't work, don't panic, it isn't broken, their site is shut down daily for maintenance and at those times they display spurious messages like the page you requested cannot be found, wait a good while and try again.

Using the HMM link above, once you select a model and are on the page that has the PDF HMM for that model, it is best to right click on the PDF HMM for your model then select Save Target AS, that way you will have the PDF HMM on your PC to refer to any time you need it.

Locating the eeprom

The 24RF08 eeprom can be accessed underneath the TP by removing the RAM expansion cover and the RAM Module if fitted.

on T23

NOTE: VCC is NOT connected, the ThinkPad supplies power to the eeprom later on we will switch on the TP to analyse the eeprom.

GND connection is the metal part of the 2 arms which normally hold the Memory modules in place.

See my page on Options for Clips and Probes including making your own probes.

Illustration below ON AN DIFFERENT MODEL TP of making the GND connection using a clip to the metal fingers that hold Memory in place.

This page ONLY describes how to connect the KeyMaker Interface to the EEPROM.

The instructions on how to Recover or clear a Supervisor password are in The "User's Guides" click here

Disclaimer

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.

If you have any questions, email Joe at

[ Home ] [ Up ] [ Your TP Model ] [ TP HM Manuals ] [ Making probes ] [ Soldering to EEPROM ] [ GND Connection ] [ 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 ] [ T420 ] [ T43 T43p ] [ T500 ] [ T510 ] [ T60 T60p ] [ T61 T61p ] [ W500 ] [ X100e ] [ X130e ] [ X200 ] [ X200T ] [ X201 Tablet ] [ X220 ] [ X30 ] [ X31 ] [ X300 ] [ X301 ] [ X40 and X41 ] [ X60 X60s ] [ X60Tablet ] [ X61 X61s X61t ] [ Z60 ] [ Z60m ] [ Z61 ] [ Z61m ] [ Z61T ] [ Other Models ]