Thanks! The 5 V TVS does seem to be a dead short right now. I will try removing it tomorrow.
Any chance you know what the specs are on the (I assume) ferrite beads on the power lines? Ideally, I'd like to replace the blown parts to bring the drive back up to spec, rather than, e.g., replacing the ferrite with a jumper.
I'm not 100% certain that the burnt component is an inductor, but I do know that WD and Samsung both use fusible zero-ohm resistors or resettable polyswitches in those same locations. This means that I can't offer any opinion as to a suitable ferrite bead. However, I do know that Seagate normally connects the TVS diodes directly across the supply pins in the majority of its models, so the inductors can't be of crucial importance unless you have a very noisy supply.
Thanks! Removing the 5 V TVS diode did get the drive up and running. My only concern is that, if I install a new TVS but simply jumper the old ferrite/inductor/whatever, overvoltage protection will be limited... It seems that, in my case, what happened is that the TVS shorted the additional voltage to ground, causing a high current through the smaller component, which burned it out and saved the drive. TVS alone will protect against ESD, but not, I think, overvoltage. I may look for an 0603 fusible component, as you suggest, to replace the smaller part.
I also have this same hard drive which just failed two weeks ago. I read through this forum but I'm not sure if the solutions that you mentioned (replacing the EEPROM chip, cutting the 5v or 12v diode) fit my problem. They sound more like the drive doesn't spin up at all.
Like 4nick8 mentioned, my drive seems to power up okay and I can hear it spinning. But then I hear a pattern of clicks like it it trying to catch onto something. This pattern repeats for about 20-30 seconds and then it stops and I can hear the platters spin down. What do you think would be the best thing to try first? Is it worth trying to replace the logic board?
brrrky, I'm not a data recovery professional, but your problem seems to be an internal one rather than a PCB issue. AIUI, if the drive clicks 11 times, then that is the signature of a head or media fault.
