JVC Speaker getting power but not producing sound

Discussion in 'Electronics Repair' started by SThundur, Jan 8, 2017.

  1. SThundur

    SThundur

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    I recently received two JVC speakers from a friend and one of them works fine, but the other produces no sound. It is getting power in both the left and right channels. I really have no idea what is wrong with it. I do not know much about speakers so keep that in mind.
     
    SThundur, Jan 8, 2017
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  2. SThundur

    davenn Moderator

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    hi
    welcome :)

    so one speaker works but the other doesn't ?

    not sure what you mean by that, please clarify ?

    do the wires to the speakers just disappear into the speaker cabinet, or are there connections on the backs of the speaker cabinets ?
     
    davenn, Jan 8, 2017
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  3. SThundur

    SThundur

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    One speaker does work. The connection is on the backside and is connected using the red and black wires.
     
    SThundur, Jan 8, 2017
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  4. SThundur

    davenn Moderator

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    OK
    so what happens when you move the possibly faulty speaker to the working channel ?
    is it dead or does it work ?

    this determines if it is a speaker or amplifier channel that is faulty
     
    davenn, Jan 9, 2017
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  5. SThundur

    tedstruk

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    If it works its not the speaker .... right?
     
    tedstruk, Jan 9, 2017
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  6. SThundur

    SThundur

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    I put it in both channels and it still didn't work, I also switched the cables and nothing. I'm sure it's the speaker. But it's getting power.
     
    SThundur, Jan 9, 2017
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  7. SThundur

    davenn Moderator

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    OK that would indicate that you have at lease 1 speaker faulty

    open it up if possible and see if there are any broken wires
     
    davenn, Jan 9, 2017
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  8. SThundur

    davenn Moderator

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    correct
     
    davenn, Jan 9, 2017
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  9. SThundur

    SThundur

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    I already opened it up and no wires are broken or look wrong.
     
    SThundur, Jan 9, 2017
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  10. SThundur

    davenn Moderator

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    it is possible for a speaker to fail without any obvious signs
    is it a single or multi - speaker cabinet .... please show a photo of the inside of the cabinet
    so I can clearly see what wires go where
     
    davenn, Jan 9, 2017
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  11. SThundur

    Audioguru VIP Member

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    Inside the speaker cabinet, measure the resistance of the speakers, and any crossover coils.

    I found two large Sony speakers on the curb (thrown away as garbage). They have 10" woofers with small magnets and the cheapest looking 3" "tweeters" I have ever seen. The tweeters were burnt out. My cheap clock radio has a similar looking 3" speaker. I replaced one tweeter and the speaker still sounded bad because the woofer simply makes boom, boom sounds.
     
    Audioguru, Jan 9, 2017
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  12. SThundur

    SThundur

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    https://imgur.com/gallery/X8Hso here are a few pictures that may help.
     
    SThundur, Jan 9, 2017
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  13. SThundur

    duke37 VIP Member

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    What do you mean by 'getting powe'. Some speakers come as a pair with power going in to one box to supply an amplifier which drives both speakers.

    If the speakers are the more powerful type with just a red and black lead going in, take an analogue meter, set it to the lowest range and measure the resistance between the red and black wires. A good speaker will measure about 5Ω and there will be a click when the meter is connected.

    Edit
    Got the pictures at last. They are three way speakers with some crossover components in a bass reflex cabinet. Measure the resistance across each driver.
    Note that when the back is replaced it must be sealed to get the right frequency response.
     
    Last edited: Jan 9, 2017
    duke37, Jan 9, 2017
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  14. SThundur

    Audioguru VIP Member

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    It is unlikely that all 3 speakers are burnt out unless it was connected to 120VAC for a fireworks show. Therefore I suspect that its main input wires are broken or quick disconnect connection has a bad crimp.
    Is this the connector on the rear?
     

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    Audioguru, Jan 9, 2017
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  15. SThundur

    SThundur

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    Yes
     
    SThundur, Jan 9, 2017
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  16. SThundur

    davenn Moderator

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    still don't know what you mean by getting power ???

    put the good speaker on the other amplifier channel and see if it works

    or if you have another old speaker lying around use it instead to save risking the good working speaker

    show a photo of the back of the amplifier so we can see where the speaker lines terminate

    examine the speaker wire VERY CAREFULLY for the faulty speaker see if it has been damaged
     
    davenn, Jan 9, 2017
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  17. SThundur

    SThundur

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    When I set me multimeter to 200ohms, I get 0.05 on the screen for the sub. The one in the middle is getting 016 MΩ and it's set at 2000M. That one seems a little odd. The third one, also the smallest is getting 010 MΩ. That seems like a big difference. Either I did something wrong or it was the speakers
     
    SThundur, Jan 9, 2017
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  18. SThundur

    SThundur

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    When I put the multimeter to logic (I think that is the one for connection) and hook the multimeter up it makes the noise. https://imgur.com/gallery/RjlVO
    I this what you were wanting?
     
    SThundur, Jan 9, 2017
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  19. SThundur

    SThundur

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    I think I have found my problem, there is a capacitor that is not working going to the middle speaker. In the speaker, the sub is the closest to the input where I would put the wires, so shouldn't the sub work? I should have spotted that sooner, sorry if I have wasted anyone's time.
     
    Last edited: Jan 9, 2017
    SThundur, Jan 9, 2017
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  20. SThundur

    davenn Moderator

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    you should be using Ohms setting


    what makes you think it isn't working ?

    you still didn't answer my Q's...
    1) what happens when you put the good speaker on the other channel ? or preferably some test speaker
    2) did you inspect the speaker line carefully for damage ?
    3) no that wasn't the pic I wanted ..... I want to see a pic of the speaker connections on the back of the amp


    Dave
     
    davenn, Jan 9, 2017
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