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ptg
 Post subject: Sandisk 20-99-00121-1 Flash Drive missing component
PostPosted: September 30th, 2020, 14:04 
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Joined: September 30th, 2020, 13:56
Posts: 5
Location: Alexandria, VA
Hi, I'm missing a component on this flash drive, which is preventing the flash drive from working. Right now, the light just blinks once, then no more life from the flash drive. Computers aren't recognizing the drive at all. I suspect that this missing component is the cause. Any help in identifying this component would be much appreciated.

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ddrecovery
 Post subject: Re: Sandisk 20-99-00121-1 Flash Drive missing component
PostPosted: September 30th, 2020, 19:03 
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Joined: June 11th, 2013, 17:01
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Location: Phoenix, AZ USA
Is one side ground and other not?

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ptg
 Post subject: Re: Sandisk 20-99-00121-1 Flash Drive missing component
PostPosted: September 30th, 2020, 19:07 
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Joined: September 30th, 2020, 13:56
Posts: 5
Location: Alexandria, VA
No, one side is .4V in diode mode and the other is .53V. Looks like one side is connected to pin 1 on the controller chip.
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ddrecovery
 Post subject: Re: Sandisk 20-99-00121-1 Flash Drive missing component
PostPosted: October 1st, 2020, 10:22 
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ptg wrote:
No, one side is .4V in diode mode and the other is .53V. Looks like one side is connected to pin 1 on the controller chip.

Are you measuring voltage of diode mode readings?

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ptg
 Post subject: Re: Sandisk 20-99-00121-1 Flash Drive missing component
PostPosted: October 1st, 2020, 10:50 
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Joined: September 30th, 2020, 13:56
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Location: Alexandria, VA
Diode mode, not voltage with it powered on
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arvika
 Post subject: Re: Sandisk 20-99-00121-1 Flash Drive missing component
PostPosted: October 1st, 2020, 12:08 
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Joined: October 24th, 2009, 15:22
Posts: 843
Location: Poland
I do not have better photo.


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ptg
 Post subject: Re: Sandisk 20-99-00121-1 Flash Drive missing component
PostPosted: October 1st, 2020, 18:38 
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Joined: September 30th, 2020, 13:56
Posts: 5
Location: Alexandria, VA
Sorry, but I need the value of the component. Can you help with that?

arvika wrote:
I do not have better photo.
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arvika
 Post subject: Re: Sandisk 20-99-00121-1 Flash Drive missing component
PostPosted: October 2nd, 2020, 5:29 
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Joined: October 24th, 2009, 15:22
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I do not have phisically this device in my lab, sorry.

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jeremyb
 Post subject: Re: Sandisk 20-99-00121-1 Flash Drive missing component
PostPosted: October 6th, 2020, 13:10 
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Joined: July 30th, 2012, 3:37
Posts: 308
Location: Fairfield, CT USA
I have a few donor boards of that model, its a fixed inductor. I have no idea what the value is though.

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ptg
 Post subject: Re: Sandisk 20-99-00121-1 Flash Drive missing component
PostPosted: October 6th, 2020, 13:37 
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Joined: September 30th, 2020, 13:56
Posts: 5
Location: Alexandria, VA
Thank you Jeremy. Yeah, I thought that I had tested a filter, but I guess I must not have. Anyways, the inductor did indeed fix the drive. Appreciate your response.

jeremyb wrote:
I have a few donor boards of that model, its a fixed inductor. I have no idea what the value is though.
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fzabkar
 Post subject: Re: Sandisk 20-99-00121-1 Flash Drive missing component
PostPosted: October 6th, 2020, 14:29 
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Joined: September 8th, 2009, 18:21
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Location: Australia
Measure the voltage on each side of the component.

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jeremyb
 Post subject: Re: Sandisk 20-99-00121-1 Flash Drive missing component
PostPosted: October 7th, 2020, 10:16 
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Joined: July 30th, 2012, 3:37
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Location: Fairfield, CT USA
fzabkar wrote:
Measure the voltage on each side of the component.

3.2v on either side of the component

ptg wrote:
Thank you Jeremy. Yeah, I thought that I had tested a filter, but I guess I must not have. Anyways, the inductor did indeed fix the drive. Appreciate your response.

No problem, glad to of helped :-)

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fzabkar
 Post subject: Re: Sandisk 20-99-00121-1 Flash Drive missing component
PostPosted: October 7th, 2020, 15:07 
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It looks like the inductor may be filtering the Vcc supply for the NAND. Measuring the voltages with the inductor removed would tell you whether the voltage was being generated internally or externally.

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