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 Post subject: st4000lm024 - fried PCB - 100794976REV C
PostPosted: April 9th, 2020, 5:57 
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Joined: April 20th, 2017, 7:28
Posts: 34
Location: Switzerland
Hi guys,

I received today Seagate st4000lm024, PC had a electrical problem and it looks like external USB drive was impacted. Drive doesn't spin, no SATA command, looks like PCB is simply not powered.

Two components on the PCB took the heat. I am not sure what they are.The big one is probably resistor or capacitor, the small black one could be fuse/diode. When I measure, both are "short". Anyone with same PCB ? Can you measure those to compare ?



Thanks


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 Post subject: Re: st4000lm024 - fried PCB - 100794976REV C
PostPosted: April 9th, 2020, 8:48 
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Joined: October 3rd, 2005, 0:40
Posts: 3040
Location: Hungary
Hello,
the small one on the right side is a TVS, the one on the left is an inductor.
It should be safe for recovery to remove the TVS and bridge the inductor if it is needed (you said it measures as shorted, so it may not be needed).
After that I suggest powering the board without connecting it back to the HDA and recording the output of the serial port. This is to ensure the pcb is functional (there may be problems with it but i give it 90% it is just fine).
If it is ok, mount it back to the hda and try it. Make a backup of your data!
It is more or less safe to run the drive without the TVS, but the next power surge will kill it for good, so it is better to replace it (the tvs) if you wanna use the drive further.
Also, do not try it in the same computer, better clone it over sata interface in a reliable pc.

pepe

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 Post subject: Re: st4000lm024 - fried PCB - 100794976REV C
PostPosted: April 9th, 2020, 17:20 
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If the inductor is intact but the diode is shorted, then the PSU should see a short circuit, in which case it should shut down. :?

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 Post subject: Re: st4000lm024 - fried PCB - 100794976REV C
PostPosted: April 10th, 2020, 6:09 
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Joined: April 20th, 2017, 7:28
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Location: Switzerland
pepe wrote:
Hello,
the small one on the right side is a TVS, the one on the left is an inductor.
It should be safe for recovery to remove the TVS and bridge the inductor if it is needed (you said it measures as shorted, so it may not be needed).
After that I suggest powering the board without connecting it back to the HDA and recording the output of the serial port. This is to ensure the pcb is functional (there may be problems with it but i give it 90% it is just fine).
If it is ok, mount it back to the hda and try it. Make a backup of your data!
It is more or less safe to run the drive without the TVS, but the next power surge will kill it for good, so it is better to replace it (the tvs) if you wanna use the drive further.
Also, do not try it in the same computer, better clone it over sata interface in a reliable pc.

pepe

Thank you Pepe. I've removed TVS Diode, that did the trick, I am imaging now.


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