24V in Samsung HE103UJ SpinPoint F1

[franics.l]

Hello HDDGurus,

i did a stupid mistake by plugging in a 24V Psu into the 3.5" USB adapter of my HDD. With the correct PSU I'm not getting any rotation, vibration or sound..

I can't see anything bad on the PCB. I found this thread: https://forum.hddguru.com/viewtopic.php?t=31944

What would you do?
Buy a used HE103UJ to replace the PCB? Or is there something similar possible like in the linked WD thread?

BR and thanks in advance!

francis

Attachments

pcb (sorry for the bad focus of the scanner)

[Lardman]

Get a multimeter and check the TVS diodes and the 0 ohm resistor bottom right next to the SATA power connector. You can't just buy a board and do straight swap you'd have to move the rom.

[franics.l]

Hey, thank you very much for the quick response.

I just checked the components. The 0 Ohm resisotor seems to be fine with 0 Ohm.

The left TVS is above 200 Ohms (OL), Diode Test isn't beeping in both directions. In on direction the multimeter is showing 950 Ohm and in the other 550 Ohm
The right TVS has about 6-8 Ohm. Diode Test is beeping in both directions

If I understood it correctly, they should "have a low resistance in the forward direction, and a high resistance in the reverse direction."
So both TVS are not working properly?

Attachments

[Tomset]

In the beginning, call here:

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ampl.png (23.4 KiB) Viewed 9693 times

[Lardman]

The right TVS has about 6-8 Ohm. Diode Test is beeping in both directions

That's effectively a wire. Assuming there's no other damage it should be safe to remove it.

[franics.l]

In the beginning, call here:

Hey Tomset, I checked both against multiple ground pins of the Sata Power connector., see Picture A

The right TVS has about 6-8 Ohm. Diode Test is beeping in both directions

That's effectively a wire. Assuming there's no other damage it should be safe to remove it.

thanks for the feedback. I will remove the diode and see if it worked. On a closer look I notice that the solder joints on this TVS are browner than the joints of the left TVS. Refer to Picture B.
I will update this thread after I have removed the tvs.

Attachments

Picture B

Picture A

[franics.l]

Hello,
I just removed the Diode and everything is working great!

Thank you very much Lardman and Tomset!

BR
Francis

[Lardman]

I assume you are now busy making a backup

If you want to keep the drive in service you really should replace the TVS diode as you have no protection any more - the next time it's overvolted it will let the magic smoke out.

[franics.l]

I assume you are now busy making a backup

If you want to keep the drive in service you really should replace the TVS diode as you have no protection any more - the next time it's overvolted it will let the magic smoke out.

thank you very much for the wise words
Yes I already did backups and I will order some replacement diodes.
BR
Francis