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Apple SSD Toshiba 656-0021B dead
http://forum.hddguru.com/viewtopic.php?f=10&t=43003		 Page 1 of 1
Author:  n3dv3d [ January 11th, 2023, 9:31 ]
Post subject:  Apple SSD Toshiba 656-0021B dead
Hello all,

I'm in need of some assistance with my SSD in the subject.
I saw a damaged capacitor (highlighted in red) , I tried to replace it but nothing changed.

Has anyone had a similar experience or know of a potential solution?
I've tried doing some research on my own, but I'm not really sure what the best course of action is. Any help would be greatly appreciated!

Thanks in advance.

Attachments:
20230111_124724.jpg
20230111_124724.jpg [ 2.99 MiB | Viewed 6172 times ]
Author:  fzabkar [ January 11th, 2023, 12:31 ]
Post subject:  Re: Apple SSD Toshiba 656-0021B dead
Are you able to access both sides of the SSD in a powered state? If so I could help you to measure the voltage test points.
Author:  n3dv3d [ January 12th, 2023, 6:08 ]
Post subject:  Re: Apple SSD Toshiba 656-0021B dead
Hello,

thank you for your reply... yes, let's try...

Let me know voltage test point I can measure

Thanks a lot
Author:  fzabkar [ January 12th, 2023, 11:58 ]
Post subject:  Re: Apple SSD Toshiba 656-0021B dead
I need to see the other side of the board.

You need to measure the voltages between ground and each inductor. One is marked "R47" plus there are two unmarked ones on the other side.

These are the datasheets:

ISL8022, Renesas/Intersil, Dual 2A/1.7A Low Quiescent Current 2.25MHz Synchronous Buck Regulator, Vin = 2.8V - 5.5V, marking 8022, DFN-12:
https://www.intersil.com/content/dam/Intersil/documents/isl8/isl8022.pdf

ISL8025A, Renesas/Intersil, Synchronous Buck Regulator, 5A, Vin = 2.7V - 5.5V, marking 25AA, TQFN-16:
https://www.intersil.com/content/dam/Intersil/documents/isl8/isl8025-25a.pdf
Author:  n3dv3d [ January 13th, 2023, 4:15 ]
Post subject:  Re: Apple SSD Toshiba 656-0021B dead
Hi,

here the other side of the board.

Thanks

Attachments:
20230112_171530.jpg
20230112_171530.jpg [ 3.12 MiB | Viewed 5981 times ]
Author:  n3dv3d [ January 13th, 2023, 5:00 ]
Post subject:  Re: Apple SSD Toshiba 656-0021B dead
The value of R47<->GND is 1,14V
Author:  n3dv3d [ January 13th, 2023, 6:00 ]
Post subject:  Re: Apple SSD Toshiba 656-0021B dead
n3dv3d wrote:
The value of R47<->GND is 1,14V


Attached measures of 8022 and 8025A

Thanks

Attachments:
8025A.jpg
8025A.jpg [ 35.14 KiB | Viewed 5962 times ]
8022.jpg
8022.jpg [ 20.95 KiB | Viewed 5962 times ]
Author:  fzabkar [ January 13th, 2023, 13:04 ]
Post subject:  Re: Apple SSD Toshiba 656-0021B dead
I expect they will be OK, but these are the other two supply voltages. Measure the voltage between each inductor and ground.

Attachments:
regs.jpg
regs.jpg [ 50.85 KiB | Viewed 5924 times ]
Author:  n3dv3d [ January 16th, 2023, 5:31 ]
Post subject:  Re: Apple SSD Toshiba 656-0021B dead
Hi,

here the measure of inductors. Is it correct?

Thanks

Attachments:
regs.jpg
regs.jpg [ 26.17 KiB | Viewed 5742 times ]
Author:  fzabkar [ January 16th, 2023, 13:24 ]
Post subject:  Re: Apple SSD Toshiba 656-0021B dead
Those supplies look OK. The other tiny components could be load switches, in which case we should check their outputs. Unfortunately I can't discern their part markings, so I can't be of any more help.

That said, the fault is most likely a firmware panic due to bad NAND. If you really wish to exhaust all hardware possibilities, please tell me the markings on all the smaller ICs.
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