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SanDisk 128G help
http://forum.hddguru.com/viewtopic.php?f=10&t=43358		 Page 1 of 2
Author:  Core.iStores [ May 19th, 2023, 4:06 ]
Post subject:  SanDisk 128G help
i not so familiar with SMD components and i am still learning them

so can someone tell me that what is the component in the attached photo please

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Author:  fzabkar [ May 20th, 2023, 2:03 ]
Post subject:  Re: SanDisk 128G help
Can you help us with a little more work?

For example, can you identify the ground pins and Vbus pins, if any?

What are the markings on the other square IC?

I suspect that both ICs may be ESD protection diode arrays. If so, then it should be OK to remove them.
Author:  Lardman [ May 20th, 2023, 2:04 ]
Post subject:  Re: SanDisk 128G help
Core.iStores wrote:
can someone tell me that what is the component in the attached photo please
Not from that potato vision picture, whatever it is you'll need to do something with the mess made to the legs/pads by what I assume were your probes.

Try tiling it at an angle or wiping some chalk over it to see if that brings up the markings better and post a fuller image so we can see it in context.
Author:  Core.iStores [ May 20th, 2023, 6:09 ]
Post subject:  Re: SanDisk 128G help
fzabkar wrote:
Can you help us with a little more work?

For example, can you identify the ground pins and Vbus pins, if any?

What are the markings on the other square IC?

I suspect that both ICs may be ESD protection diode arrays. If so, then it should be OK to remove them.




thanks for your reply

is the picture clean to you ?

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Author:  Core.iStores [ May 20th, 2023, 6:09 ]
Post subject:  Re: SanDisk 128G help
Lardman wrote:
Core.iStores wrote:
can someone tell me that what is the component in the attached photo please
Not from that potato vision picture, whatever it is you'll need to do something with the mess made to the legs/pads by what I assume were your probes.

Try tiling it at an angle or wiping some chalk over it to see if that brings up the markings better and post a fuller image so we can see it in context.


thanks for your comment

is that what you want me to do ? :)

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Author:  fzabkar [ May 20th, 2023, 13:26 ]
Post subject:  Re: SanDisk 128G help
@Core.iStores, you haven't answered our questions. Do you have any tool other than a thermal camera? A camera may be useful for a mechanic, but someone who professes to be a data recovery professional should have a multimeter.
Author:  Core.iStores [ May 20th, 2023, 14:22 ]
Post subject:  Re: SanDisk 128G help
fzabkar wrote:
@Core.iStores, you haven't answered our questions. Do you have any tool other than a thermal camera? A camera may be useful for a mechanic, but someone who professes to be a data recovery professional should have a multimeter.



Dear @fzabkar i wrote on the second photo about the pins you can see them after you enlarge it

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Author:  fzabkar [ May 20th, 2023, 14:35 ]
Post subject:  Re: SanDisk 128G help
Sorry, I missed that. However, I still can't make out the markings on the other IC. The "context" that @Lardman was referring to is a full photo of both sides of the PCB. This is necessary to allow us to see all the components so that we can create a block diagram in our minds. What I can tell from the datasheet for the large IC is that it requires a 3.3V supply. This must come from a discrete 3.3V LDO regulator IC, or it can be produced by an LDO inside the flash controller.
Author:  Core.iStores [ May 20th, 2023, 14:49 ]
Post subject:  Re: SanDisk 128G help
fzabkar wrote:
Sorry, I missed that. However, I still can't make out the markings on the other IC. The "context" that @Lardman was referring to is a full photo of both sides of the PCB. This is necessary to allow us to see all the components so that we can create a block diagram in our minds. What I can tell from the datasheet for the large IC is that it requires a 3.3V supply. This must come from a discrete 3.3V LDO regulator IC, or it can be produced by an LDO inside the flash controller.



the device is SanDisk Dual Port 128G " SanDisk 128GB Ultra Dual Drive Go USB Type-C Flash Drive " and i just wanted to make as clear as possible

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Author:  fzabkar [ May 20th, 2023, 14:55 ]
Post subject:  Re: SanDisk 128G help
This is the kind of protection device that is commonly used for USB and HDMI:

https://ro.mouser.com/datasheet/2/258/ESDLC3603P3_DFN1616_6_-2510314.pdf

Obviously it is inappropriate for your application, but I was wondering whether there were two protection devices to accommodate all the pins.
Author:  fzabkar [ May 20th, 2023, 15:09 ]
Post subject:  Re: SanDisk 128G help
That IC is a switch. There must be a controller and flash memory somewhere.

HD3SS3212, Texas Instruments, Two-Channel Differential 2:1/1:2 USB3.1 Mux/Demux, 3.3V, marking HDS3212, VQFN-20:
https://www.ti.com/lit/ds/symlink/hd3ss3212.pdf

Can you determine where the IC's Vcc pin (6) is getting its power from? Is the Vcc pin connected to one of the pins of the two smaller ICs? This would help to determine whether one of the smaller ICs is a regulator.

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Author:  Core.iStores [ May 20th, 2023, 15:24 ]
Post subject:  Re: SanDisk 128G help
fzabkar wrote:
That IC is a switch. There must be a controller and flash memory somewhere.

HD3SS3212, Texas Instruments, Two-Channel Differential 2:1/1:2 USB3.1 Mux/Demux, 3.3V, marking HDS3212, VQFN-20:
https://www.ti.com/lit/ds/symlink/hd3ss3212.pdf

Can you determine where the IC's Vcc pin (6) is getting its power from? Is the Vcc pin connected to one of the pins of the two smaller ICs? This would help to determine whether one of the smaller ICs is a regulator.



okay i will

i attached the under chip number

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Author:  fzabkar [ May 20th, 2023, 15:30 ]
Post subject:  Re: SanDisk 128G help
It looks like it combines the controller and flash in a single package. I'm wondering whether USB 2.0 will work.

That said, I would first ensure that the 3.3V supply is OK. I would measure the resistance between Vcc and ground. If the controller is sharing the same Vcc, and if it is low, then it may be that the controller is bad.
Author:  Core.iStores [ May 20th, 2023, 15:58 ]
Post subject:  Re: SanDisk 128G help
fzabkar wrote:
It looks like it combines the controller and flash in a single package. I'm wondering whether USB 2.0 will work.

That said, I would first ensure that the 3.3V supply is OK. I would measure the resistance between Vcc and ground. If the controller is sharing the same Vcc, and if it is low, then it may be that the controller is bad.


this is what i found. It sounds that as you said the controller is bad

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Author:  fzabkar [ May 20th, 2023, 16:16 ]
Post subject:  Re: SanDisk 128G help
What is the voltage on pin #6 (Vcc) of HDS3212?
Author:  Core.iStores [ May 20th, 2023, 16:25 ]
Post subject:  Re: SanDisk 128G help
fzabkar wrote:
What is the voltage on pin #6 (Vcc) of HDS3212?


all the 3 Vcc pins are 0.6 V
Author:  fzabkar [ May 20th, 2023, 16:33 ]
Post subject:  Re: SanDisk 128G help
What is the resistance between Vcc and ground.

If the Vcc isn't being generated by either of the two small ICs (you can test for continuity between Vcc and each of the 2 x 6 pins), then it must be coming from the controller, in which case the controller is bad, or is not getting 5V, or is being overloaded by one of the ICs.

That said, it doesn't explain why IC "72" is getting warm.
Author:  Core.iStores [ May 20th, 2023, 17:01 ]
Post subject:  Re: SanDisk 128G help
Quote:
What is the resistance between Vcc and ground.



about 93.0 KΩ

Quote:
If the Vcc isn't being generated by either of the two small ICs (you can test for continuity between Vcc and each of the 2 x 6 pins), then it must be coming from the controller, in which case the controller is bad, or is not getting 5V, or is being overloaded by one of the ICs.



no continuity between Vcc and each of the 2 x 6 pins


Quote:
That said, it doesn't explain why IC "72" is getting warm.
Author:  Core.iStores [ May 20th, 2023, 17:15 ]
Post subject:  Re: SanDisk 128G help
Quote:
That said, it doesn't explain why IC "72" is getting warm.


i checked the "72" and found that the continuity is between the RED pins alone and the BLUE pins alone

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Author:  fzabkar [ May 20th, 2023, 17:53 ]
Post subject:  Re: SanDisk 128G help
Quote:
no continuity between Vcc and each of the 2 x 6 pins

That means that the controller must be generating the 3.3V supply for the MUX IC. This suggests that those small ICs are protection devices or perhaps they are switches?

I'm wondering whether this flash device is idiot proof. I'm thinking that it would be possible for a user to find a way to power both ends of the drive at the same time. This could potentially damage one or both USB hosts. Perhaps one of these ICs is intended to protect against such a scenario?

In the absence of power, I would test for continuity between Vbus-3.0 and Vbus-C. If they are connected, then this means that there is no protection. If they are not connected, then I would test for continuity between each of the Vbus sources and each of the pins of the two ICs. If both Vbus sources are connected to the same IC, then this would suggest that this IC is a power selector switch.
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