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USB Memory Stick, unknown smd components

Discussion in 'Troubleshooting and Repair' started by Sadlercomfort, Nov 18, 2014.

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  1. Sadlercomfort

    Sadlercomfort Ash

    424
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    Feb 9, 2013
    Hi Guys,

    I have a usb stick which has become damaged due to dry solder on all 4 usb contacts on the pcb.

    I tried to do a 'quick' fix, which I wish I hadn't done. Because the soldering iron removed two smd components off the board. I've finally bought a hot air station to replace the smd components. . But I don't know which ones I need.

    I think one was a capacitor and one resistor. Which values do I need to use?

    I'll try upload a picture as soon as possible.
     
  2. davenn

    davenn Moderator

    13,866
    1,958
    Sep 5, 2009
    values ? who knows ( well the manufacturer would)
    do you know for sure it was one of each ?
    do you know for sure which went where ?

    yes a pic may help make it obvious :)

    Dave
     
  3. Sadlercomfort

    Sadlercomfort Ash

    424
    55
    Feb 9, 2013
    received_10154786123245333.jpeg received_10154786123330333.jpeg 7
     
  4. Sadlercomfort

    Sadlercomfort Ash

    424
    55
    Feb 9, 2013
    On the board it says D*, R3 and C4

    So maybe there's a diode missing aswell? It's a cheap one, so I can't find the manufacturer mark.
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

    11,655
    2,696
    Nov 17, 2011
    Hard to say without a schematic or a way to measure the missing components.


    If you desperately need the data on thsi stick:
    • Get a new stick of the identical make.
    • Swap the missing components one by one from the good stick to the old one.
      Alternatively, but more complex: swap the controller and memory from the old stick to the new one.
    • Read the data (hopefully).
    • Throw away both sticks.
     
  6. Sadlercomfort

    Sadlercomfort Ash

    424
    55
    Feb 9, 2013
    I have two of the missing components, but I doubt anything would be measurable because they are burnt.

    It's all about the data really, so yeah I'm going to try and find out where to buy the same one. Swap the components over.

    If in the meantime I do find a schematic, I'll post it =D Cuz I don't understand them much.
     
  7. Harald Kapp

    Harald Kapp Moderator Moderator

    11,655
    2,696
    Nov 17, 2011
    Good luck.
     
  8. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,497
    2,839
    Jan 21, 2010
    The best solution may be to purchase another USB stick of the same type and use it as a source of parts.
     
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