Can any one tell me what is this part

Discussion in 'General Electronics Chat' started by rastaman46, Apr 21, 2014.

  1. rastaman46

    Thread Starter Member

    Nov 17, 2011
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    Can any one tell me what is this part in red circle ??

    Its fish tank light transformer

    All id does now just blinks light once .

    I dissembled it and found this are is quiet burn round this part


    Is any one have a clue what is it ?

    Thanks
     
  2. odinhg

    Active Member

    Jul 22, 2009
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  3. rastaman46

    Thread Starter Member

    Nov 17, 2011
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    is there any special settings or i can buy anything?

    Or where can i buy one?
     
  4. rastaman46

    Thread Starter Member

    Nov 17, 2011
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    Can it cause circuit for being non working unstable?

    Thanks
     
  5. t06afre

    AAC Fanatic!

    May 11, 2009
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    Looks like some inductor to me, and it is also labeled L104. Which also point to that it is some sort of inductor. Why do you want to replace it?
     
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  6. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    It appears the device has opened up, allowing no current to flow. That very well could make the entire circuit not work.

    However, without more knowedge of the full circuit no one can offer a reasonable suggestion to proceed. If the device appears to be a wire within a tube you may be able to replace the wire inside, though I would have to ask what made the wire itself fail.

    Just replacing the wire may just make a big spark next time you turn it on.
     
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  7. MaxHeadRoom

    Expert

    Jul 18, 2013
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    + on the inductor, you will find it is a piece of copper wire with a ferrite cylindrical bead, it will either measure short circuit or open.
    It may be discoloured from the current it carries.
    Max.
     
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  8. ian field

    Distinguished Member

    Oct 27, 2012
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    Its literally a ferrite bead with a wire running through the middle - if it was damaged, it would be fairly obvious.
     
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  9. alfacliff

    Well-Known Member

    Dec 13, 2013
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    its a thermal fuse. look for ratings on it for degrees. it is designed to open up at a certain temprature.
     
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  10. MaxHeadRoom

    Expert

    Jul 18, 2013
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    If it is a fuse i would have expected a different notation than L.
    Also a thermal fuse should have a rating No. on it.
    Max.
     
    Last edited: Apr 21, 2014
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  11. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    From it's appearance, I would say a thermal fuse.

    Ken
     
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  12. rastaman46

    Thread Starter Member

    Nov 17, 2011
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    Ho do i approach to find correct part for it?

    Its measures up as open

    Its only one are on entire circuit with burn marks just round this area

    Thanks
     
  13. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    View of the whole board, both top and bottom would help. Any marks you can see on the component?

    Ken
     
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  14. t06afre

    AAC Fanatic!

    May 11, 2009
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    It looks like some power transistor has been removed from the circuit board. Then a power transistor fails. Components around it may fail. Still assuming it is an inductor. It would not be uncommon that it may have burned out(result open circuit), due to higher current than it is rated for.
     
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  15. rastaman46

    Thread Starter Member

    Nov 17, 2011
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    There no markings on this part

    I attached Top/Bottom Pictures
     
  16. alfacliff

    Well-Known Member

    Dec 13, 2013
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    its a little hard to see in the picture, if it has a metal shell with a white insulator on one end with the wire coming out, it is a thermal fuse. does the equipment have a nameplate with a temprature rating?
     
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  17. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I see they have combined the L notation/B notation, in other positions, B is a solid jumper, so logically this would be a solid jumper with a Ferrite sleeve?
    The rest of the inductors are labeled L.
    Max.
     
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  18. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
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  19. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    Looks like "the component" is on the opposite side of the PCB from a surface mount power transistor...top edge, to the left of the surface mount bridge rectifier. On the screen print side the PCB is discolored above that transistor. That makes me more inclined to think it's a thermal fuse.

    I can't see a solid jumper wire with a ferrite bead likely opening without much more signs of damage.

    Ken
     
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  20. rastaman46

    Thread Starter Member

    Nov 17, 2011
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    So do i go for Color Code "Orange" Thermal fuse?
     
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