Hi Folks,

I have a a Seagate ST4000DX000 with faulty PCB - looks like a classic TVS problem.
But i never seen this PCB, and can't find the TVS's on this one.
Please see PCB on the links below:
https://dl.dropboxusercontent.com/u/49559271/PCB-3.jpg
https://dl.dropboxusercontent.com/u/49559271/PCB-1.jpg
https://dl.dropboxusercontent.com/u/49559271/PCB-2.jpg


Any help with finding the TV's on this one would be great.

Thanks

The devices near the SATA power connector appear to be electronic fuses.

I would test the output side of each fuse. If the corresponding voltage is not present, then test for a short circuit between the output and ground.

NIS5132, 3.6A 12V Resettable Electronic Fuse, marking 32:
http://www.diodes.com/datasheets/NIS5132.pdf
http://www.onsemi.com/pub_link/Collateral/NIS5232-D.PDF

NIS5135, 3.6A 5V Resettable Electronic Fuse, marking 35:
https://www.onsemi.com/pub/Collateral/NIS5135-D.PDF

NIS5135 appears to be equivalent to STEF05:
http://www.st.com/web/en/resource/techn ... 034383.pdf

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