fzabkar wrote:
Searching this forum for "TVS" will find absolutely nothing.
Instead, here is the information in a nutshell:
http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.htmlLots of photos of TVS diodes here:
http://www.users.on.net/~fzabkar/HDD/That said, a surge often damages the motor controller chip, in which case your most expedient solution would be a board swap and firmware transfer. If location U12 is vacant, then a firmware transfer is not a simple DIY proposition. However, some board suppliers include this service for US$10 - $20.
Thanks for your reply.
Yes the motor controller chip has been damaged, it's the same as this chip:

so can you please tell me which PCB i need to replace mine.
i have tried many PCB in more than one shop but they didn't know how to get it work again, so please can you tell me how to get the working PCB for my HDD ?
so i can buy it.
another case i'm not sure but i think there is tech man that he swapped the ROM chip and has lost it ( i guess ) so what is the solution for this?
thanks in advance