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 Post subject: Mac SSD Component Identification Help
PostPosted: February 19th, 2018, 13:14 
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I have a Sandisk SD5SL2-512G-1205E SSD in for recovery. I need help identifying this component. The laptop had a power failure and looks like its taken out this 8 legged component. There was also a solder ball on the resistor next to it, so presumably the whole area has been subjected to heat. The component blew out the left side as you look at it. There might be some board damage but wanted to clarify what this component does before proceeding any further. I cannot find a schematic for it. Its near the power connector, but does not look like a fuse to me.


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SSD.jpg
SSD.jpg [ 2.14 MiB | Viewed 1396 times ]

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 19th, 2018, 14:40 
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I suspect that the device may be a load switch or e-fuse.

Could we see the whole PCB? Please don't mirror the image this time. :oops:

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 19th, 2018, 15:07 
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Sorry about the mirroring. I have a new scope and the camera reads mirrored. I have not had a chance to look at why yet :-)

Hope these pics will help.


Attachments:
20180219_114806.jpg
20180219_114806.jpg [ 2.26 MiB | Viewed 1377 times ]
20180219_114738.jpg
20180219_114738.jpg [ 4.06 MiB | Viewed 1377 times ]
20180219_114728.jpg
20180219_114728.jpg [ 5.37 MiB | Viewed 1377 times ]

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 19th, 2018, 16:15 
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Here is an account of a data recovery from an identical fault:
http://datosrecuperados.com/datarecovery/portfolio/ssd-memoria-air-pro-mac-recuperacion/

It appears that in their case the fault was localised to the damaged component.

I suspect that this component need not be replaced. Instead you may be able to bypass it, if all the other componentry is OK. However, your photos are too poor for me to work with. If you could scan both sides with a CCD scanner (not CIS), then I could probably help you. At least tell me the markings on the other components, especially the ones near the edge connector.

BTW, I have examined the markings on similar components. It appears that "C7" is the device code (it is common to all the examples). The third character varies, which suggests that it is some kind of batch or date code.

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 19th, 2018, 17:13 
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Can you tell us the marking on this component?

Attachment:
e-fuse.jpg
e-fuse.jpg [ 84.45 KiB | Viewed 1350 times ]

If this is an e-fuse, then the "C7" component must be something else, possibly a load switch or MOSFET.

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 19th, 2018, 17:28 
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fzabkar wrote:
Can you tell us the marking on this component?

Attachment:
e-fuse.jpg

If this is an e-fuse, then the "C7" component must be something else, possibly a load switch or MOSFET.

There is a logo on the chip that I do not recognize, but the numbers on the chip are:-

1321
.Q20U

The Q may be a 0 its not too clear.

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 19th, 2018, 17:38 
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Is this it? (the datasheet has a logo)

GD25Q20C, GigaDevice, 2Mbit, 2.7V - 3.6V, serial flash memory:
http://www.gigadevice.com/product/download/146.html?locale=en_US

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 19th, 2018, 19:18 
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If this is your component ...

NTHD4102P, ON Semiconductor, -20V, -4.1A, Dual P-Channel ChipFET, marking C7:
http://www.mouser.com/ds/2/308/nthd4102p-d-1194494.pdf

... then I believe it is functioning as a load switch, in which case you could probably bridge the Drain and Source terminals. However, we would first need to confirm that there is no additional damage downstream.

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 19th, 2018, 19:32 
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Good work, I really appreciate it. I cannot visibly see any other damage. I have tested as many caps as I can and cannot find a short. I don't have a donor board or schematics to look at diode mode readings. Is there any way I can test downstream more thoroughly?

I also see that the component has 2 sources and 4 drains. Do we choose Source 1 to either of the two Drain 1's.

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 19th, 2018, 19:59 
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I would need better photos/scans to make a confident assessment, but ISTM that all four drains would be connected together, and both sources would also be connected together. The sources would be connected to the supply input from the connector.

I believe the 10-pin component is an LDO regulator:

MAX8516EUB, Maxim, LDO Regulator, marking AAAH, 1.425V to 3.6V input, 1A, 0.2V dropout, uMAX-10:
http://chip.tomsk.ru/chip/chipfile14-x.nsf/all/47257D440013B434C625790800615D35/$File/MAX8516-MAX8518.pdf
https://datasheets.maximintegrated.com/en/ds/4262.pdf

The two OAL components are buck regulators:

TPS62590, Texas Instruments, 1A, 2.5V to 5.5V, Step Down Converter, 2.25-MHz, marking OAL:
http://www.ti.com/lit/ds/symlink/tps62590.pdf

I would measure the resistance between ground and each of the regulator outputs.

I would also measure the resistance between ground and the MOSFET drains, after removing the MOSFET.

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 20th, 2018, 14:47 
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The 10-pin component has a resistance of 136.
The 6 pin connectors 350 and 136.
All drains on the failed component read at 261.

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 20th, 2018, 15:53 
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There are no short circuits at any of the loads, so I believe it should be OK to try bypassing "C7x". You just need to connect the drains to the sources.

Before you do this, just verify that the drains are connected to the inputs of the regulators. Also, can you tell us the markings on the four small 4-pin components?

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 20th, 2018, 16:40 
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The drains are connected to the regulator inputs. The 4-pin components are marked:

U6A 0H
T9A 0T
3XT 1A

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 20th, 2018, 16:48 
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Also one more question. There are two sources (S1, S2) and four drains (D1, D1, D2, D2). Any advice on which to bridge to which. Or are they all interconnected?

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 20th, 2018, 16:55 
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ddrecovery wrote:
Also one more question. There are two sources (S1, S2) and four drains (D1, D1, D2, D2). Any advice on which to bridge to which. Or are they all interconnected?

Are the two MOSFETs connected in parallel. That is, are all 4 drains connected together on the PCB, and are both sources connected together?

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 20th, 2018, 16:59 
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All 4 drains are interconnected as are the 2 sources. So I presume one connection will do unless that may overload a particular line?

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 20th, 2018, 17:03 
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One connection should do. Good luck.

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 Post subject: Re: Mac SSD Component Identification Help
PostPosted: February 20th, 2018, 17:17 
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fzabkar wrote:
One connection should do. Good luck.

Working like a charm. You really are the electronics guru. Many thanks :D

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