L512

 

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

EEPROM Location and Type

Treat L512 EEPROM as a 24RF08

Locating the L512 connection points

Switch the L512 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.

Once you have your HMM search the manual for "Removing and replacing a FRU" follow the instructions on Keyboard removal.

Keep individual modules and their screws separate to make it easier to re assemble it correctly

The eeprom is on the top of L512 system board.

You have to disassemble the keyboard, the frame of the power switch and a metal shield cover

Keep individual modules and their screws separate to make it easier to re assemble it correctly

You need to access the 8 pin chip, a PS08 eeprom which is located on the top side of the system board under the Keyboard.

The eeprom is a PS08 which is equivalent to a 24RF08, so any reference in the following text to a 24RF08 applies to this eeprom

I do not have photos of the L512 System Board.

If you are working on an L512 and can take 2 decent photos that I can use, I will give you a discount on the purchase of your KeyMaker. 

Not as silly as it sounds, you can download the HMM, remove the System Board, take the 2 photos, email me me your photos [keep file size below 5MB] and then purchase your KeyMaker from me at a discount.

2 photos are required, an overall view of the location of the PS08 and a close-up of the PS08.

The image below is from a DIFFERENT System Board, it illustrates the connection points to a PS08.

The eeprom is a PS08 which is equivalent to a 24RF08, so any reference in the following text to a 24RF08 applies to this eeprom

THIS IS A L412 system board which should be similar to L512, the connection points to the PS08 EEPROM, the L512 uses the same EEPROM but the actual board layout is DIFFERENT.

 

 

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

The photo below shows a 24RF08 EEPROM from a DIFFERENT MODEL ThinkPad with the Pomona clips attached to SCL and SDA pins.

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.

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

Click here for pictures of GND Connections

Basically you make the System board functional outside of it's case which includes mounting heat sink and fan on CPU.

Once you have taken care of the GND connection.

You push the sharp probes onto SCL SDA , this is the reason you need 2 persons, not enough hands to hold the probes and run the software.

This is not easy, you will need to have the Keyboard [and optionally the LCD] plugged into the system board in such a way that none touch any contacts on the system board, use paper as an insulator to keep things from electrically shorting out, later you will need to plug in the AC adaptor and switch ON the TP, then you will need to hold 2 probes in place to the SCL and SDA points on the system board.

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

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

 

Assembling your TP - AFTER - you have finished.

Follow the Hardware Maintenance Manual [FRU System Board], very carefully, double check screw type and size for each individual module.  Assemble the TP in the reverse order used to dismantle it.

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

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