Service Forum

[nge89]

Hey Guys,
i have a IBM Thinkpad T42 and tried to unlock it, but i get the error
" ERROR: Curcuit not found or Bus Error", when i try to read the eeprom.
I think the curcuit is alright. What else could be the problem?

nge89

[nge89]

Can u try to help me when i upload a picture of my circuit?

[nge89]

Pls, just reply

[victor]

Hi,

Sorry for the delay, buddy. Sure, let's see it.
_________________
Victor Voinea
ALLservice HQ, Romania.

[nge89]

No problem, im just glad someone answered. Im not sure if i used all the
right things for the curcuit. I used 2x 5W 2K2 Resistors and 2x Z-Diode BZX79C5V1 R0 and as cable i used some cables from a monitor cable.
Here is the picture:



Uploaded with ImageShack.us

Thanks for reply

[victor]

The diode at the SDA line (lower one in your picture) must be reversed.
_________________
Victor Voinea
ALLservice HQ, Romania.

[nge89]

Thx man, but now i get the error "EEPROM not avaible" What could be the problem here?

[victor]

Hi,

That's a good thing, so the interface works.
Next, check the wires to eeprom. Put the GND wire to the T42 chassis (VGA out screws/nuts) and see where you connect SDA and SCL probes.

Good luck, pal!
_________________
Victor Voinea
ALLservice HQ, Romania.

[nge89]

Ah man, it finally worked. Seems like a wire wasnt soldered well.
Thx for your help. Im really glad there are still people like you out there,
who do great work in helping people in forums with problems.
I never thougt i could do this by myself. I appreciate your help very much. Thx again

[victor]

Well, I have a good heart, what can I say..

Thanks buddy, you made me a happy evening too.
_________________
Victor Voinea
ALLservice HQ, Romania.