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gameboybin
 Post subject: Samsung 970 Evo Plus 500GB no power
PostPosted: March 15th, 2026, 12:29 
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Joined: April 17th, 2022, 22:39
Posts: 204
Location: Vietnam
I got this 970 Evo plus Samsung NVME SSD
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I have measured some capacitors. None of them gives any voltages
Upon Heat inspection the only chip that have a slight temperature is this AtAYF chip
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The drive consuming 0.1A

Thanks for helping me out!
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fzabkar
 Post subject: Re: Samsung 970 Evo Plus 500GB no power
PostPosted: March 15th, 2026, 14:08 
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Joined: September 8th, 2009, 18:21
Posts: 16963
Location: Australia
"AtAYF" is an e-fuse. There should be 3.3V at Vin and Vout.

https://www.hddoracle.com/viewtopic.php?p=8872#p8872

I expect that its pinout would be similar to STEF05:

https://www.hddoracle.com/download/file.php?id=3096&mode=view

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fzabkar
 Post subject: Re: Samsung 970 Evo Plus 500GB no power
PostPosted: March 15th, 2026, 15:59 
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Joined: September 8th, 2009, 18:21
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fzabkar wrote:
I expect that its pinout would be similar to STEF05:

Perhaps it's similar to STEF4S rather than STEF05.

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gameboybin
 Post subject: Re: Samsung 970 Evo Plus 500GB no power
PostPosted: March 21st, 2026, 7:13 
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Joined: April 17th, 2022, 22:39
Posts: 204
Location: Vietnam
So i managed to fix the drive. The problem was the Power IC S2FPS05A01. After swapping the chip. The drive started working again
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