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Does anyone recognise this symbol?

Discussion in 'General Electronics Discussion' started by ElectricBabe, Sep 11, 2014.

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  1. ElectricBabe

    ElectricBabe

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    Sep 11, 2014
    Hello everyone!
    I'm new here and a bit of an electronics novice, so i need some help!
    Im trying to fix my Philips TV and have hit a bit of a 'roadblock' . The tv is getting no power . There are few caps blown but I think the problem is a small component next to the fuse.. The problem is I'm not sure what it is! It looks like a small resistor and the symbol is similar to that of a resistor but with rounded edges...not one I've seen before. Does anybody know what it is and where I can find a replacement?
    Thanks
    Joanne
     
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Hi Joanne and welcome to Electronics Point :)

    Can you upload some pictures? The component and/or its circuit symbol?
     
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  3. ElectricBabe

    ElectricBabe

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    Sep 11, 2014
    ezyF20Fa.jpg
     
    Last edited by a moderator: Sep 13, 2014
  4. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Got it. I'm not sure what it is either. Could be a thermistor. What does the component look like?
     
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  5. ElectricBabe

    ElectricBabe

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    Sep 11, 2014
    A small resistor looking thing, but its transparent in the middle. Its arcing across when the power plug is plugged in. Does it being next to the fuse give any hints?
     
  6. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    No. Can you upload a photo of it?
     
  7. Harald Kapp

    Harald Kapp Moderator Moderator

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    Yep, pictures would be fine.
    Does it look like one of these:[​IMG]
    Then chances are it is a ceramic filter (see 1207 and 1104 here).
     

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  8. ElectricBabe

    ElectricBabe

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    Sep 11, 2014
    Not until later, I thrust it upon my dad to take to maplins, to see if they had any idea, and he isnt back until later :(
     
  9. Harald Kapp

    Harald Kapp Moderator Moderator

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    Well, arcing doesn't sound like a ceramic filter, more like a fuse that has blown.

    Sorry I missed the part of the conversation before my post while I was googling )
     
  10. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Probably best to wait till then.

    It seems odd that the symbol looks like a resistor with an obround around it, it looks like a fuse or maybe a spark gap, and it's arcing. Doesn't sound like anything I recognise.

    Is there a circuit reference printed on the board beside the position?

    I'm going to sleep now but Harald will sort you out
     
  11. ElectricBabe

    ElectricBabe

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    Sep 11, 2014
    The symbol is like that, but with a ---/\/\/\/\/\/---
    In the middle :)
     
  12. ElectricBabe

    ElectricBabe

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    Sep 11, 2014
    The reference is RA8002 , thank you for your help :D
     
  13. davenn

    davenn Moderator

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    That's commonly the symbol for a fusible resistor
     
  14. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    That seems like a good explanation Dave. The description doesn't really sound like a fusible resistor, but we will see...

    Joanne, what is the model number of the TV set?

    Can you post in-focus pictures of both sides of the circuit board in that area?
     
  15. Y2KEDDIE

    Y2KEDDIE

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    Sep 23, 2012
    It may be a VDR (Voltage Dependent Resistor). Bascly a thermistor. Used for supressing power surges. It has a high resistance when cold and decreases as current flows though it. Try placing a 100 watt incadescent light bulb in the circuit in place of the device. Tthe bulb should light and the cicuit power up.
     
  16. shrtrnd

    shrtrnd

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    I can't say with certainty, but I'm with davenn on this. The oval circle is the generic symbol for a fuse, the resistor in the middle of it would indicate a fusible resistor to me.
    With engineers being trained us U.S. schools, European schools, and wherever the engineers are coming from for Pacific Rim products, it's hard sometimes to keep-up with
    whose symbols or combinations of symbols are being used anymore.
     
  17. Arouse1973

    Arouse1973 Adam

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    The barreter has a oval circle and is not a fuse. I dont think we can make that assumption. It depends if you use IEEE or ANSI I guess.
    Thanks Adam
     
  18. davenn

    davenn Moderator

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    that takes me back to the tube radio days !! :)
    not something you typically see or hear of in modern electronics
     
  19. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    It has been a long time since any of my cars had one either!

    More seriously, are they at all related to platinum RTDs?
     
  20. FirstSpear

    FirstSpear

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    Sep 13, 2014
    Howdy. Did a search for RA8002 and found this pdf

    https://www.epm.com.co/site/Portals...ecnicas/NORMARA8-002_revision2010_VFINAL1.pdf

    Yep it is in Spanish, but the title at the top of each page reads, "Current limiting resistors for the protection of transformers..." Corriente = current, fusible = fuse; much is readily translatable as the electronic terms are very similar to the English. It contains some photos, and a cutaway diagram of the internal makeup of the device. It does, though, deal with very high voltages, but given all the speculation about fusible resistors, it seemed worth the post.

    To muddy the waters further... The diagram presented in the thread is a schematic, and that outline resembles a crystal to me. Just saying.
     
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