Question about IBM ThinkPad T23 2647 Notebook
There is a i2c EEPROM ( not the BIOS rom memory ) where the checksum of bios and settings is stored. It's often 24C01 or a member family 24C0X . A picture can be see at
There is two possibilities:
1 _ Reset notebook to factory defaults to restore default options of cmos bios setup. There is a hole on botton side, see the manual where is and how to reset it. Connect it "in circuit" with a i2c "in circuit" programmer ( see SPI ), for example PONYPROG interface to a serial from another computer and write the right checksum for other identical notebook ( same model AND same bios version ), also resetted to factory defaults.
2 _ Exchange the IC. If the firmware detect a empty IC there is A CHANCE that it reprogram itself. I was write "a chance" because this depend of version of bios. You will need a hot air desoldering station, often used for fix cell phones, PDAs and expertise, care and patience to do this.
I'm have a thinkpad t23 with same problem, when I resolv this I'll post more info about this issue.
Posted on Mar 30, 2008
This won't fix your problem but did wanted to put my input. This error basically means bad bios. IBM suggestion is to replace the board but ofcourse that is expensive. Keep me updated on any solutions you find. Somehow you need to flash your bios.
Posted on Nov 12, 2007
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