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SMD broken

Discussion in 'Troubleshooting and Repair' started by stepsan, Dec 12, 2012.

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  1. stepsan

    stepsan

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    Dec 12, 2012
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    I'd say it is a transistor or mosfet that has been damaged by hear (overload essentially)

    Can you read what it has printed on top of it? The best I can make out it is 0100.
     
  3. stepsan

    stepsan

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    Dec 12, 2012
    It has printed 010D as much as I can read. What do you suggest I can replace with?
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    My cross-reference guide does not list a part marked 010D

    Maybe we can figure out what the device is by inspection... Anyone?

    (We'll probably need good close-up images of both sides of the board though).

    edit: Are there any other components with the same markings?
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

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    It could be
    010 SO918R SGS - SOT23 Si-npn (source)
     
  6. stepsan

    stepsan

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    Dec 12, 2012
    There is another identical component that you can see in the photos. I have changed the burnt one with the other and now the circuit works correctly. I still don't know what component is. Thanks in any case.
     
  7. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    OK, the whole point of asking is there is another similar component is so we (you) can do measurements and determine what it is.

    If this one fails too, where are you?

    Also, by removing this transistor you have disabled some functionality and I can't tell what that is.
     
  8. stepsan

    stepsan

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    Dec 12, 2012
    Sorry for delay. What kind of test can I do to determine what it is?
    I have a multimeter and an oscilloscope to check it.

    The faulty chip is related with the charge of the batteries.
     
  9. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    You need to use your multimeter to measure between all the pins of the device (6 measurements because you do it both ways) while it is out of the circuit.

    From that we may be able to tell what the function is. We might be able to guess at a device you can try to replace it with.

    We'll also need to know what the device is, the voltage it runs from, and the current that high intensity LED draws.
     
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