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CreativelyChris
 Post subject: Blown TVS Diode on Seagate 8TB
PostPosted: October 22nd, 2022, 20:39 
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Joined: October 10th, 2022, 15:48
Posts: 4
Location: Los Angeles
I burned out a TVS diode on a Seagate 8TB drive (ST800NMN0055).

I can see the burnt diode (see picture), not sure if this is the 5V or the 12V?

I've removed the diode but the drive doesn't spin up. I'm assuming I need to solder over a fuse?
Can someone help me what needs to be done next?


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fzabkar
 Post subject: Re: Blown TVS Diode on Seagate 8TB
PostPosted: October 22nd, 2022, 20:59 
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Joined: September 8th, 2009, 18:21
Posts: 16955
Location: Australia
That's not a TVS diode -- it's a 12V electronic fuse (NIS5132):

http://www.hddoracle.com/viewtopic.php?f=100&t=1615&p=8872#p8872

Photo of similar PCB:

https://ae01.alicdn.com/kf/S67743187395f4980b8e1f7b1bde441fcF/hard-disk-circuit-board-is-suitable-for-10t12t-Board-No-100784953-Reva-is-measured.jpg

The solution is to run a bridging wire from Vin (Vdd) to Vout (Source). Make sure there are no shorts between Vout and ground.

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CreativelyChris
 Post subject: Re: Blown TVS Diode on Seagate 8TB
PostPosted: October 22nd, 2022, 21:51 
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Joined: October 10th, 2022, 15:48
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Thanks for the info!

So if I understand right, just one connection from here to here (See picture)?


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fzabkar
 Post subject: Re: Blown TVS Diode on Seagate 8TB
PostPosted: October 22nd, 2022, 22:40 
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No, don't do that.

Do this:

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CreativelyChris
 Post subject: Re: Blown TVS Diode on Seagate 8TB
PostPosted: October 23rd, 2022, 0:01 
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Joined: October 10th, 2022, 15:48
Posts: 4
Location: Los Angeles
Ahh thank you for the clarification!

One bridge wire from 12Vin to 12Vout or 3?

Thank you for the help!!
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fzabkar
 Post subject: Re: Blown TVS Diode on Seagate 8TB
PostPosted: October 23rd, 2022, 1:00 
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Joined: September 8th, 2009, 18:21
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Just one.

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