Overvoltage (TVS Diode Dead)

[CedHild]

Hello everyone. My HDD (Seagate Barracuda ST3000DM001) died last week. ( I think it got overvolted because i plugged the SATA-Power Connector in the wrong slot on the powersupply. (Yes, stupid, but it was behind my waterpump so i couldn't see well behind there))

It didn't turn on anymore. Just dead, no noise. My DVD drive smelled horrible after (also dead)

I searched alot on the internet and also here and found out that it could be that the TVS Diode is killed.



I think the red one is the 5V diode. Anyway, if i check the diodes with the multimeter(with that special diode function) i get:
Orange: 600 and 1 (i think this is right?)
Red: 0 and 0 (falling from 100 down to 0 in 1 second)

Looks like the 5V(Red) is dead? I can't see anything else that could be wrong on the board.

Now, can i just solder it out and replace it with another diode? I have 2 other HDDs here that i don't need anymore.


I'm not sure if i could use these yellow ones (they all look the same) Mesure (100/0, 80/100 (wtf?), 100/0)


Blue (190/1) Green(450/1680) Green seems not normal?! Maybe my multimeter is too shitty.


Anyone can confirm my statements and say what i should do? I still want to use my HDD so running it without diode would be stupid(?) and buying just 1 diode from a supplier is not very funny (paying 10.- only for postal charges )


already happy for replies! thanks.

[dmarques]

Hi,

You can remove the diode and get your data (if it's just that).
To run your drive, it would be good to have a new one there.

[fzabkar]

The "QA" part is the 5V TVS diode. Remove it.

You also need to measure the zero-ohm resistors near the SATA power connector. They will probably be open circuit.

Zero-ohm-resistors.jpg (115.61 KiB) Viewed 8662 times

BTW, the diodes that you have circled on the WD board are not TVS diodes. They are in fact Schottky diodes.

On the Hitachi PCB, the "LE" part on the left is a 12V TVS diode while the "WE" part is a 5V TVS diode.

Here are direct links to your full sized photos:

http://www.abload.de/img/img_3712etsl1.jpg
http://www.abload.de/img/img_3720lkxj2.jpg
http://www.abload.de/img/img_37175uazw.jpg

[CedHild]

Thanks alot for the replies!

My drive works again!!

Well, here is what happend:

i removed the 5V diode = didnt boot up. Then TRIED to solder the 0 ohm ones. no luck soldering them, they were too small and it just didn't want to stick there. i tried and tried and ruined everything (after a while there was that black/brown dirt everywhere). I had already given up and just soldered a ton on everything (both 0 ohm diodes). Booted up and it worked

Is it bad if both of these connections are soldered together?
I'm backing up everything at moment. I don't have any 5v diode installed anymore. Will the HDD die quickly if i run it without? Normally, there wouldn't be any overvoltage anymore. I think my powersupply is great and not some random nonamecrap.
Even if the HDD would die one day, could it damage other things? I know its not that great idea to still run it, but i really don't want to spend money for a new HDD again (I just build the computer 2 months ago and it wasn't very cheap)

greetings

[fzabkar]

I can't comment on your soldering, but running without a TVS diode is perfectly OK as long as the drive never experiences an overvoltage.

Of course you will now backup your data on a regular basis ...