After prolonged abstinence Basel-I dared no longer a functioning IBM Thinkpad 600x. Before the "repair" the Thinkpad was a prompt for an unknown supervisor password and acknowledges each command with an error screen that pointed to the manual, which counseled for this situation a service to stay with IBM.
A little research on the net showed that the required password is not encrypted and can be reset in a built-on the system board I2C EEPROM (AT24CT08 name) is stored. To this situation
Lord gives it to be next to the exchange of the system board at IBM for about 500 EUR Two other, less expensive options:
- Swap I said the chips
- Reading the password chips and decode the password
I chose the first option, since I had found on ebay a provider of "fresh" I EEPROMs. Two days after the order arrived the object of desire: an SMD component on the size of about 3 x 5 mm with 16 pins in the sub-millimeter spacing. 
The laptop must be completely disassembled to get to the system board. Thanks to IBM for downloadable hardware reference manuals to succeed without any problems, only the perceived billion on small parts should be carefully . Keep 
is the hard part of the operation, however, the replacement of the component itself, as the old EEPROM are first removed. I think that I damaged on this occasion the board, as it is almost impossible without SMD equipment to heat all the pins of the chips equally to the component from the board to separate. I lack the appropriate equipment with a watchmaker's screwdriver and levered processed while the 35W roasting the legs. The new chip is soldered in principle not difficult, but we must not use too much solder as this love between the tight-fitting connections and flows of the component after short circuits produced. If this happens then one can throw the board at the top right (I remember as dark on such a wayward tuning attempt at a 7200 Powermac) ;-)
result
produced by the assembly of the Thinkpads are after power but no password prompt more, it was an approximately 10 positions comprehensive list of error codes (173, 161, 193, 188 etc. etc..) out, which would suggest that the incorporation of the new EEPROM was not successful.
The Thinkpad is now used as a toy for my two boys and with diminishing Interest the way to start recycling center.
