But it will be too late then !

If you are not willing to help it costs me some euros (for the empty working thai disk) anyway cheaper than a diagnosis of some guru that cant repair it either in th end or just can't find the right numbers of the chips better just by searching longer or happens to have the right logic board WITH corresponding partnumbers If you seach for 8 pin eprom smd by ST chips there are hundreds of numbers that all refer to the same pinout but just to confuse us and custumers (and RD experts too i guess) So if you can't or just don't WANT to help, dont't reply on my request for INFO and HELP to GET ACCESS to my old drive again.. and yes ... offcourse i want to keep my data to myself!

T H A N K S !!!

If you are not willing to help it costs me some euros (for the empty working thai disk) anyway cheaper than a diagnosis of some guru that can't repair it either in the end or just can't find the right numbers of the chips better than idid just by searching longer and finding nothing in the end at all, or happens to have the right logic board WITH corresponding partnumbers by chance.

If you seach for 8 pin eprom smd by ST chips there are hundreds of numbers that all refer to the same pinout but just to confuse us and custumers (and RD experts too i guess to make an sxpert more experienced after all i repaired allready wice my disk by replacing the tvs) So if you can't or just don't WANT to help, dont't reply on my request for INFO and HELP to GET ACCESS to my old drive again.. and yes ... offcourse i want to keep my data to myself!

T H A N K S !!!

I found out it must be the 25P0SVP or 2spzero so just find out if there is some PDF file of this chip anyway gonna try this.

Who told you that the pcbs are compatible - regardless of ROM?

Who told you that the pcbs are compatible - regardless of ROM?

I think he is confused and is referring to any 8-legged SOIC as an EEPROM

Or else I am confused and have not been able to figure out what he is really saying

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You don't have to backup all of your files, just the ones you want to keep.

BIG NEWS AND SUCCESS !! DISK IS WORKING AGAIN! I FOUND OUT THAT THE EPROM PARTS ARE IDENTICAL I MEAN THE EPROMS, AS SAID BEFORE , and no matter what that the board layaout is different I GOT IT WORKING FINE AGAIN with the board from Thailand (China was never at war i think with them also....)!! But they have their own spicey bite to the outworld!


After exchanging the chip http://www.datasheetcatalog.org/datashe ... s/7641.pdf for this one http://pdf1.alldatasheet.com/datasheet- ... H-2.7.html
and studying of the pinout it has the exact same features... it carefully resoldered the chips and exchanged it and VOILA spinning and running and 100 percent fine now!

IMPORTANT IS THAT SPINNING UP is HARD WITH THESE DRIVES AND CONTACTS (logic board to inner parts, heads and spindle motorr) WILL CORRODE EASYILY, MAYBE THIS IS THE REASON FOR THE SPINUP PROBLEMS AND FAILURE? & POWER SURGES

Copy data as fast as you can then...

So you moved the EEPROM from your dead PCB to the China PCB you had that was the same part number or...?

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You don't have to backup all of your files, just the ones you want to keep.

My understanding is that the OP transferred the original EEPROM to the physically dissimilar board and now has a functioning drive. So I guess this proves that the PCBs are functionally identical.

It seems we all learned something.

Yes, as i wrote the EPROMS come in many brands and number layouts but are thus identical. Thanks everybody for the word doc to help me find out the right numbers on the chips!

Congratulations! I'll be sure to add your success story to my list of "consequences of DIY".

If all we're talking about is a successful EEPROM move from one board to another of the same p/n then that's not exactly news, but OP doesn't ever make it clear if that was what he was asking

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You don't have to backup all of your files, just the ones you want to keep.