Need help with donor board

[net2005]

Hi all HDD Gurus, I'm new to this site and I need some help with my hard drive. Problem with my drive was that it was not spinning and system can't detect it. I got donor board and now drive spins. Can someone tell me which one is the rom chip that I need to move from the original board? Picture of logic board attached.

Thanks in advance.

Attachments

[fzabkar]

U3 is an SPI serial flash memory (LE25FU106B), but what are the markings on U6?

BTW, there is a fuse (F1) near the SATA connector. Can you measure its resistance with a multimeter? Can you also measure diodes D1 and D2?

LE25FU106B, Sanyo, 1M-bit (128K×8) SPI Serial Flash Memory, 2.3V - 3.6V:
http://www.onsemi.com/pub_link/Collater ... 106B-D.PDF

[pcimage]

U6 is the NVRAM, U3 is the ROM.

You definitely need to swap the NVRAM chip (be VERY careful, they are fragile devices and if you mess it it up it could be an expensive mistake as it contains UNIQUE data for the drive including the S/N)

If the first 2 lines of the PCB stick match then the ROM is most likely the same version so you won't need to swap it. BUT I have seen differing ROM versions of supposedly compatible boards so a ROM swap was also required.

As fzabkar says, check the fuse at F1 first though, it should be close circuit. The diodes rarely fail on these drives, but maybe worth checking anyway.