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Old 11-14-2016, 08:31 PM   #1
CapLeaker
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Default HDD either turns computer off or HDD spins up and down (fixed)

I added another external HDD bay to my computer and ran out of SATA power plugs. Dang! Grabbed another cable to plug in the PSU and the HDD, turned the computer on and the fan made a tick and that was it.
WHAAAAT? Man, that can't be... the HDD ran 10 mins earlier.

The problem happened, because I grabbed the wrong SATA power wire for the PSU. Here is a little warning: An Antec PSU has the same SATA power plugs than an EVGA PSU. They will fit each other perfectly, BUT: they are wired backwards!!!

What happens then is that either the Computer stays is STBY and when you press the on button, it only turns on for a split second, or you hear the HDD spin up, doing some scratching, then spin down again. That's it.

On the back of the HDD is a little circuit board. Depending on brand / design you may have to remove it to get at the bad component. The SATA power has three voltages. In my case the plug was wired backwards at the PSU, so 12 volt got on the 5v rail and shorted the TVS diode that goes from 5v to GND very near the plug in. Remove the bad diode and all is well, but it is not protected anymore from power spikes or from another power reversal, wrong voltage, etc. The TVS diode had marking AE which is a 5v TVS diode that works both ways, unlike a regular diode. Replacement was a 1SMA5.0 available at Digi-Key for my Hitachi HDD.

Apperantly I am not the only one and found this at WD website:
https://community.wd.com/t/hdd-tvs-diode-faq/14692

Surly sux, but haven't lost the drive.

Last edited by CapLeaker; 11-14-2016 at 08:34 PM..
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Old 11-14-2016, 10:11 PM   #2
eccerr0r
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Default Re: HDD either turns computer off or HDD spins up and down (fixed)



Oh gosh I am utterly afraid of those "modular" PSUs. Hate hate hate.
1. The one you need is always missing.
2. They're not standardized.
3. Another connector, another failure point.
4. PSU is effectively bigger now that there's something sticking out from the back and something that was really close to fitting no longer does.
...

sigh...

I have two PSUs with modular plugs, one that was given to me, and another which is an Antec NeoHE that I had purchased. I kept all of the extra, unused cables with the PSU inside the case in hopes I will never misplace them if I ever need the extra cables...
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Old 11-14-2016, 10:29 PM   #3
keeney123
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Default Re: HDD either turns computer off or HDD spins up and down (fixed)

Quote:
Originally Posted by CapLeaker View Post
I added another external HDD bay to my computer and ran out of SATA power plugs. Dang! Grabbed another cable to plug in the PSU and the HDD, turned the computer on and the fan made a tick and that was it.
WHAAAAT? Man, that can't be... the HDD ran 10 mins earlier.

The problem happened, because I grabbed the wrong SATA power wire for the PSU. Here is a little warning: An Antec PSU has the same SATA power plugs than an EVGA PSU. They will fit each other perfectly, BUT: they are wired backwards!!!

What happens then is that either the Computer stays is STBY and when you press the on button, it only turns on for a split second, or you hear the HDD spin up, doing some scratching, then spin down again. That's it.

On the back of the HDD is a little circuit board. Depending on brand / design you may have to remove it to get at the bad component. The SATA power has three voltages. In my case the plug was wired backwards at the PSU, so 12 volt got on the 5v rail and shorted the TVS diode that goes from 5v to GND very near the plug in. Remove the bad diode and all is well, but it is not protected anymore from power spikes or from another power reversal, wrong voltage, etc. The TVS diode had marking AE which is a 5v TVS diode that works both ways, unlike a regular diode. Replacement was a 1SMA5.0 available at Digi-Key for my Hitachi HDD.

Apperantly I am not the only one and found this at WD website:
https://community.wd.com/t/hdd-tvs-diode-faq/14692

Surly sux, but haven't lost the drive.
Well at least you found it. That is what happens when cables are standardized.
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Old 11-15-2016, 12:54 AM   #4
jiroy
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Default Re: HDD either turns computer off or HDD spins up and down (fixed)

That's very nasty , Standards must remain standards , or next we will see a red common .. Thanks for the warning anyway .
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Old 11-15-2016, 12:36 PM   #5
CapLeaker
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Default Re: HDD either turns computer off or HDD spins up and down (fixed)

I agree that this shouldn't be. I was surprised once I checked the pins on the modular side of those cables. Anyway... my Digikey order is on it's way, so not too big of a deal.

Windows 10 at is best again, as it first loads all kinds of crap (HDD light is now solid on for the past 10mins) and then it needs a restart.
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