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I broke my SSD after applying 28 V and I have to change the component by the red arrows in the picture. The component is marked "FNC1B" and it is QFN10 package. It should be a MOSFET or an optocoupler. Below the component "P LN" is a PTC. The FNC1B and PTC drive the same line (5 V line.) On some SSDs (same model) the FNC1B is placed while on others the PTC is placed.

enter image description here

JRE
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123 456
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  • Are you sure you actually broke the PTC? Because that would be a very hard thing to do. – Lundin May 23 '23 at 09:39
  • PTC is not mounted. This image has same configuration with my ssd board. PTC is mounted in this board above picture, FNC1B is mounted in my ssd board. PTC is dismounted in my SSD board. In my opinion FNC1B was broken in my board, because when I dismounted FNC1B from my board short circuit is vanished. – 123 456 May 23 '23 at 09:43
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    _"It should be MOSFET or optocoupler."_ What led you to this conclusion? – winny May 26 '23 at 08:01
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    28 V is quite a lot for a low voltage logic device. Are you really sure nothing else got fried (like the controller or the flash itself)? Given that this looks like an entirely ordinary cheap SATA SSD, I suspect that repairing it is going to be much more expensive than just replacing it. – TooTea May 26 '23 at 08:36

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The package and markings match with a Silergy SY6875A current limit switch.

enter image description here

You can find images on LCSC to confirm the markings style also matches.

nanash1
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  • Thank you so much. How did you find this although only from a picture and some letters on it? – 123 456 Jun 09 '23 at 12:00
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    @123456 Since it was an alternative to a PTC, I searched LCSCs "TVS/Fuse/Board Level Protection" category and filtered by the package in question. LCSC has pictures for all parts they stock, so you can look for matching markings quickly without opening datasheets. – nanash1 Jun 09 '23 at 15:51