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 Post subject: When customers try to help . . .
PostPosted: July 13th, 2016, 15:58 
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Someone attempted to "repair" this drive. :shock:


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 Post subject: Re: When customers try to help . . .
PostPosted: July 13th, 2016, 16:28 
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Chip-off recovery, it is then.

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 Post subject: Re: When customers try to help . . .
PostPosted: July 13th, 2016, 20:52 
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Man, that's shameful. It's hard to tell whether chip-off is required; it might clean up nicely with a little flux and solder wick.

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 Post subject: Re: When customers try to help . . .
PostPosted: July 13th, 2016, 21:22 
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LarrySabo wrote:
Man, that's shameful. It's hard to tell whether chip-off is required; it might clean up nicely with a little flux and solder wick.


Unfortunately, there are SMT parts suspended in the globs of solder. From whence they came, I know not . . .


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 Post subject: Re: When customers try to help . . .
PostPosted: July 13th, 2016, 22:04 
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jono-ats wrote:
Unfortunately, there are SMT parts suspended in the globs of solder. From whence they came, I know not . . .
That was clear from the picture. Nevertheless, I would expect that once the abundance of solder is wicked up, the SMTs and their original positions might become obvious. Comparing the PCB to another in good condition would make it obvious.

That's just me speaking from ignorance, but necessity is the mother of invention when one doesn't do chip-off recoveries. Maybe that was the other tech's motto, too, now that I think of it. :)

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 Post subject: Re: When customers try to help . . .
PostPosted: July 14th, 2016, 1:19 
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LarrySabo wrote:
Nevertheless, I would expect that once the abundance of solder is wicked up, the SMTs and their original positions might become obvious.

I had the same idea. ISTM that it can't be too difficult for a competent tech to restore the status quo. It's certainly not a "chip-off" candidate at the moment.

Edit: BC? and BC4 appear to be the chip capacitors for the crystal (~10pF). There is probably a 1M resistor between the pins of the crystal.

Code:
             Y
             _
            | |
        .--|| ||--.
        |   |_|   |
        |   ___   |
        +--|_R_|--+
        |         |
       ---       ---
    BC ---       --- BC
        |         |
        |         |
       ===       ===
       GND       GND

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 Post subject: Re: When customers try to help . . .
PostPosted: July 15th, 2016, 23:01 
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fzabkar wrote:
I had the same idea. ISTM that it can't be too difficult for a competent tech to restore the status quo.


Unfortunately, I'm incompetent.

fzabkar wrote:
It's certainly not a "chip-off" candidate at the moment.


Oh yes it is.

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 Post subject: Re: When customers try to help . . .
PostPosted: July 15th, 2016, 23:19 
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Lol. I think Jon knows what he's talking about. Probably stuff you can't see from the picture.

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 Post subject: Re: When customers try to help . . .
PostPosted: July 16th, 2016, 1:21 
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Obviously the stick has suffered physical damage. This suggests that there was no electronic fault at the outset. Clearly the user (or DR shop?) tried to reattach the connector, perhaps by using wires. In fact I believe I can see the end of such a wire in the foreground. There are maybe 4 passive components which need to be repositioned. I have already outlined those that are associated with the crystal. Such a circuit is STANDARD practice for crystals. There is NO reason at the moment for a "chip-off" kneejerk.

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 Post subject: Re: When customers try to help . . .
PostPosted: July 16th, 2016, 2:23 
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Here are several standard crystal circuits taken from various manufacturers' reference schematics. Is this really too difficult?


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 Post subject: Re: When customers try to help . . .
PostPosted: July 18th, 2016, 11:35 
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Thank you for your help, fzabkar.

I appreciate it.

Jon

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 Post subject: Re: When customers try to help . . .
PostPosted: August 10th, 2016, 23:38 
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Well, I need to give fzabkar his props here.

The data was encrypted by Bitlocker, and efforts to reconstruct the data from the chip reads proved too difficult for the controller used.

So I reinstalled the two NAND memory chips, cleaned up the PCB by removing the solder blobs, and took some guesses about missing parts.

My reason for going with the chip read approach was to have a copy of the composite data, in case efforts to rebuild the drive ended up damaging the controller or the NAND memory.

We got 100% yield, including viruses. :-)

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 Post subject: Re: When customers try to help . . .
PostPosted: August 11th, 2016, 1:09 
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Thank you for your feedback.

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 Post subject: Re: When customers try to help . . .
PostPosted: August 11th, 2016, 11:17 
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Thanks for your help.

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