Does anyone know why I have a stack of bad A1708 SSD's on my desk?

[bjf]

I have a small stack of SSD's that aren't being recognized. Tested in multiple computers. I'm having a hard time believing all of these SSD's are just dead. Is anyone else seeing anything like this?

 

[2informaticos]

Any history?
Disk Utility doesn't recognize them at all?

 

[bjf]

No, they don't show up at all. They're all pulled from liquid-damaged computers, but they're all clean inside the metal shielding. I'm not sure if these are somehow more delicate than older drives. It's hard to understand why they're all bad.

 

[2informaticos]

Data, or control lines maybe got overvoltage from 5V, or higher rail...
Compare resistance to ground with a good one.

 

[SMMRepair]

These A1708's are sooooo fragile compared to other models...wouldn't be surprised if the SSDs followed that pattern. I think Apple wanted to ensure these things die very easily from liquid-damage. Not protecting the CPU power supplies in particular was a great decision by Apple. /s

 

[bjf]

Ok, thanks for the input. It sounds like it might just be a reality with these. And yes, maybe they were exposed to an overvoltage situation. It's definitely possible.

It's odd too because we sold a good one to someone who claimed it killed their logic board. I found this extremely difficult to believe, but he claimed it happened twice. After receiving it back, I plugged it into a good board and it worked fine and has worked fine ever since. Who knows. Either way, I don't work on these so I'll just sell them as-is and get rid of them.

 

[ALB-Repairs]

2016/17 SSD's arnt always compatible in these. To test youd need both the 820-00840 and the 820-00875 boards. Im not sure if there is different BOMs on those boards for different SSD's.

 

[bjf]

Thanks, yes, I've wondered about that. I was most recently testing them in a fully functional 2016 model (820-00875). The SSD's may all may be 2017 models but I'm not sure which part numbers are which. These are 656-0074B and 656-0070A.

 

[ALB-Repairs]

Thanks, yes, I've wondered about that. I was most recently testing them in a fully functional 2016 model (820-00875). The SSD's may all may be 2017 models but I'm not sure which part numbers are which. These are 656-0074B and 656-0070A.

I can tell you i have modified a 2016 board to work with a 2017 SSD in the past. But i had a pile of dead 2017 boards to inspect for differences near the SSD connector. It was a while ago so i cannot remember the parts i changed.

 

[bjf]

That's interesting. My SSD's might all be from 2017 models. I guess I'll find out eventually next time I test them in a 2017.