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 Post subject: Samsung 860 EVO SSD 1 TB over voltage repair
PostPosted: August 24th, 2020, 15:23 
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Joined: August 23rd, 2020, 22:59
Posts: 3
Location: united states
Hi Folks,
I made the mistake of swapping power supplies in two of my pc's, a evga 850w with a evga 1000w, and switched all cables except sata. The result overvolted 2 of my 860 evo 1 tb ssd's. Yes now I know I should have paid attention to the manual to always use original cables, but I thought since same manufacturer it would be fine (it would be nice of evga to prevent future user error by changing their form factors for the differing cables). I have read a couple posts here of similar situation with 850 evo ssd where replacing the e-fuse with a STEF4S repaired the drive. I have been trying to identify the efuse on the 860 but the layout is a bit different from the 850. Any guidance is appreciated, I would like to get these drives operable again. Fortunately I had nearly all important files backed up in the cloud, but still some I would like to retrieve. I have a few STEF4S ic's already ordered if they turn out necessary.

I don't see any burn damage and there was no smoke nor smell, just the drives could not be recognized by bios. Thanks for your help.

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 Post subject: Re: Samsung 860 EVO SSD 1 TB over voltage repair
PostPosted: August 24th, 2020, 20:30 
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Joined: September 8th, 2009, 18:21
Posts: 12584
Location: Australia
Here it is:

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STEF4S.jpg
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You can bypass it with a wire link by connecting Vin to Vout, with caveats.

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 Post subject: Re: Samsung 860 EVO SSD 1 TB over voltage repair
PostPosted: August 24th, 2020, 21:02 
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Joined: August 23rd, 2020, 22:59
Posts: 3
Location: united states
@fzabkar Thank you sir, I'll update with results.


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 Post subject: Re: Samsung 860 EVO SSD 1 TB over voltage repair
PostPosted: August 25th, 2020, 0:21 
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Joined: August 23rd, 2020, 22:59
Posts: 3
Location: united states
Success! It wasn't easy to solder the wire, but at least there are 3 vins and 3 vouts. Thank you again fzabkar, many blessings to you in this life and the next.

Interesting, that the 2nd evo 860 drive I hotwired had a much different pcb layout but I was able to identify the efuse.

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