Please help me to find this SMD transistor

Discussion in 'General Electronics Chat' started by madhushankarox, Oct 14, 2015.

  1. madhushankarox

    Thread Starter New Member

    Mar 30, 2015
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    Can some one please help me to find this transistor or any other one replacement for this?

    [​IMG]

    Is this a BCX54-10 NPN Silicon AF Transistor?
     
  2. DerStrom8

    Well-Known Member

    Feb 20, 2011
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  3. madhushankarox

    Thread Starter New Member

    Mar 30, 2015
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    This is a working one. I got an exploded one very similar to this which is used to power up illuminations of a car audio. Any thoughts?
     
  4. DerStrom8

    Well-Known Member

    Feb 20, 2011
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    Are the markings the same?
     
    madhushankarox likes this.
  5. madhushankarox

    Thread Starter New Member

    Mar 30, 2015
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    Yes. I think they both are same :rolleyes:

    [​IMG]

    I was fixing a broken flex cable. It worked for a day and when I tried to re assemble the face plate, edge of the flex cable was bent and overlapping each other. Last two paths are used for illumination. Set works fine without illumination now.. :( As you can see there are bit thicker paths close to each other (bottom, last 2 paths)

    [​IMG]
    [​IMG]
    [​IMG]

    Before fail that Transistor, illumination was working.

    [​IMG]
     
  6. DerStrom8

    Well-Known Member

    Feb 20, 2011
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    I expect something in the flex shorted and popped your transistor. Not a whole lot I can do to help at this point.
     
  7. madhushankarox

    Thread Starter New Member

    Mar 30, 2015
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    This is what happened.. hmm bad luck after a successful fix.

    [​IMG]

    However I think I found the correct transistor.

    [​IMG]

    Thanks for your time.
     
  8. madhushankarox

    Thread Starter New Member

    Mar 30, 2015
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    Sorry a wrong one is highlighted.
     
  9. DerStrom8

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    Feb 20, 2011
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    I wouldn't trust that unless you know for a fact that you have the right manufacturer. Every manufacturer has different codes. BC may be designating the base and collector, and QR is the code you want.

    upload_2015-10-14_15-29-25.png

    Hoping someone else can pitch in here, I'm grasping at straws.

    Matt
     
  10. madhushankarox

    Thread Starter New Member

    Mar 30, 2015
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    Hmm.. you are right. this transistor will be a good grand since the set is an Addzest Japan
     
  11. madhushankarox

    Thread Starter New Member

    Mar 30, 2015
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    I found a transistor named BC QN and I replaced with the failed one. Everything works fine. ~3V for illumination, all works. not heating up or anything. Just normal.
     
  12. DerStrom8

    Well-Known Member

    Feb 20, 2011
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    You're lucky. That was very daring. Just because the letters are similar does not mean the transistors are similar. If you put in the wrong transistor (even if it had similar markings to the old one) you not only could have blown it, but you could have blown the rest of the unit too.
     
  13. madhushankarox

    Thread Starter New Member

    Mar 30, 2015
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    Hmm.. I think I am. However I didn't solder that transistor first. I make some connections with very thin, hairy wires first.
    Was hoping them to act like fuses lol..

    [​IMG]

    After 12 hours, it still works continuously :)
     
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