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390 390E 390X you
treat it as a 24RF08
Locating the 390 series
connection points
Switch the 390 OFF.
You should have downloaded the hardware
Maintenance Manual already, if you have not done so use one of the 3
links below to download it now,
ThinkPad
390, i Series 1720 models - Hardware Maintenance Manual (November 1998)
ThinkPad
390E Hardware Maintenance Manual (March 1999)
Hardware
Maintenance Manual for the ThinkPad 390X
The links above are to the IBM/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
Using the appropriate TP 390 Hardware Maintenance Manual and your nice small Philips screw
driver, dismantle the TP
Follow the Hardware Maintenance manual
"FRU Keyboard" to lift up your TP's Keyboard and gain access to the
underside of the System Board where the 24RF08 eeprom is located.
The eeprom is directly under the F2 key under the keyboard,
on top of system board, remove led cover plate, undo 2 screws holding
keyboard, pop plastic lock by pushing it backward under the LCD panel hinge,
the lock is just behind the INSERT and HOME keys, it moves backward.
Lift up the keyboard from the end nearest the
LCD, no need to disconnect the keyboard, just lift it to one side, place
a sheet of paper in front of the LCD to protect it and rest the keyboard
against the LCD at an angle.
There in a square hole in the casing under
where the F2 key normally is, you can see the AT24RF08CN 8 pin SOIC eeprom.
 
This is the orientation of the 24RF08CN
on the system Board facing the TP as you would see it normally when operating
it.
There is more than one way to connect to the
eeprom, it all depends on YOUR SKILLS, lighting and your eyesight etc.
Make sure you have really good lighting to see
the small pins, a bare 60W globe hanging from the ceiling high above you in a dark
room will make this job impossible.
The EEPROM is down a hole in the plastic
casing, you may be able to solder to the pins, I have done this many times,
people tell me they can't do it.
You could use sharp probes to contact the SDA
and SCL pins on the EEPROM.
If you wish to use Pomona SMD Grabbers then
you will have to strip the machine down a lot more to remove the plastic frame
above the EEPROM and the reason for doing that is that the Pomona SMD grabbers
need to be at about 30 degrees up from the flat PCB and you cannot achieve that
angle with the plastic frame in the way.
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.
Assembling your TP
You need to re-assemble or partially re-assemble your TP
[depending on your chosen connection method] as you will have to have it
switched ON and running to read the eeprom.
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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