Service Forum

[steve5214]

Hi,
I have a Thinkpad 600 Type 2645-850 which seems only to have a 24C01A chip....I dont seem to be able to locate a 24rf08.... Am i missing it or is this the only chip i have ?
Cheers
Steve.

[victor]

Yes, that is the chip you have and below is the procedure for 24C01:
http://www.allservice.ro/forum/viewtopic.php?p=264#264

24C01 has the same layout for SDA, SCL and GND like the 24RF08 (8 leads) shown in the schematics.

[steve5214]

Hi Victor,
Thanks for the help and the pointer to the other posts.I am using Simple Serial I2C (not great at electronics) If I understand things correctly I should as a minimum be able to connect GND To GND, SCL and SDA to the interface, WP to GND.

Just to clarify..

"Connect SDA, SCL and GND to the interface.
WP must be on GND.
Vcc to 4,5-5V
A0,A1,A2 (the addresses) can be simply tied to GND. If you put all to
GND
you must modify again the 2CBaseAddress=0xA0."

A0,A1,A2 can be GND but not essential ?
I have the chip still on the board so dont need to conect Vcc to anything as the Tinkpad powers it ?

"All Gnds: Interface's, eeprom, power supply must be fitted togheter!
GND: eeprom pins: A0, A1, A2, GND, WP + COM1 pin#5+ power GND."

I understand this bit except " + power GND"

All my GND's are connected back through the technician pc via COM1 pin5 - is that ok ?

I tried with just GND To GND, SCL and SDA to the interface, WP to GND result was
"Hardware error, is the board properly connected? (-14) "

If I disconnect the thinkpad from the interface I get
"Device not responding"
So i guess it must be detecting something.

Sorry to be a pain in the a**
Cheers
Steve.

[victor]

No, no, not this. This is for the stand alone eeproms (not soldered), that guy (Alvin) removed the eeprom from the Thinkpad and I told him how to do it that way.

You gotta build the driven-i2cprog and read the eeprom as it is, in system. Just build the circuit and read exactly the post I gave you.
Stick only 3 wires to SDA, SCL and GND, the procedure is the same as for the 24RF08 the difference is that you use other software to read. The circuit must be the driven circuit based on max232, otherwise you have to desolder the eeprom.

remember:
1. Read the sticky tutorial on how to recover TP passwords just to accomodate with the procedure.
2. Build the max232 circuit (driven-i2cprog.pdf)
3. Get PonyProg from lancos.com and proceed exactly as instructed in this post
http://www.allservice.ro/forum/viewtopic.php?p=264#264

Good luck!

[steve5214]

Victor.... You are a saint...it worked...took a little figuring out but thanks....
Cheers
Steve.