LED repair assistance

Discussion in 'Anything DIY Related' started by Duimpies, 25 Mar 2014.

  1. Duimpies

    Duimpies

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    Hi Guys

    One of my Led unit panels has gone on the blink, the blue lights have died. Apparently one can just replace the bulbs.

    Is there anyone that can assist me with in Northen suburbs? I have a youtube link on how to do it, i just dont have the tools to do it. and where can one get replacement blue globes

     
    Last edited by a moderator: 27 Nov 2015
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  3. jclaas

    jclaas

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    Here is a thread regarding LED chips and where you may find them in SA: http://www.marineaquariumsa.com/wanted/51090-leds-wanted.html

    You may find that not all the LED chips are blown and that it may be one or two causing a break in the series of blue chips. That is why you see the person in the video using a multimeter to test the chips. He most probably was testing continuity.
     
  4. Duimpies

    Duimpies Thread Starter

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    shot, exactly what i am looking for, the prob i am in cape town, they in pe.. i just need like 1-2 chips
     
  5. Andre@ReefAquatics

    Andre@ReefAquatics Sponsor

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    Leds are only connected in series. You can short out the faulty led. Look for the faulty led with the diode test on a multimeter.

    I have some chips if you dont come right. Is it smd or pinned chips?
     
  6. Duimpies

    Duimpies Thread Starter

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    Hi Andre

    I have no clue, its the exact same unit in video clip. they show the chips on the clip.

    I dont have a multi meter, hence looking for some one that can assit.

    Kind regards
    Damian
     
  7. riaanwium

    riaanwium

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    shipping shouldn't be expensive and the LED's are cheap.
     
  8. Andre@ReefAquatics

    Andre@ReefAquatics Sponsor

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    Buy a cheapie for R50 at builders. Put it on diode test. The red lead on the anode and black on cathode. If the led is ok it should glow. The faulty one will not.
     
  9. Duimpies

    Duimpies Thread Starter

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    great thanks
     
  10. Andre@ReefAquatics

    Andre@ReefAquatics Sponsor

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    Pm me your no and ill talk you through it.
     
  11. Duimpies

    Duimpies Thread Starter

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    will do, first want to get multimeter. check which chips are dead.
     
  12. Andre@ReefAquatics

    Andre@ReefAquatics Sponsor

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    Cool its easy as chips. Sometimes leds create a flux over them and goes duff. But some blow an open circuit stopping current flow. Im sure you have a whole line of leds not working. As @ jclass mentioned its only one culprit
     
  13. SeanR

    SeanR

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    This is the exact reason why I didnt connect mine in series.
    I hope you come right.
    Sean
     
  14. hadiosbourne

    hadiosbourne

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    Hi
    I'm in welgemoed,
    i'll be happy to help
    send me a message
     
  15. Andre@ReefAquatics

    Andre@ReefAquatics Sponsor

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    How did you not connect in series that means your supply is 3v?
     
  16. jclaas

    jclaas

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    @SeanR

    Think you need to use resistors.
     
    Last edited by a moderator: 26 Nov 2015
  17. SeanR

    SeanR

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    Howsit guys sorry for late reply.
    My system is 12v.
    Yes @jclaas is correct I am using resistors. I have an resistor on each positive of each led. It doesn't cost alot extra for resistors.
    At the end its all worth it.
    Busy planning my next led add on at the moment, Just choosing the right colours first.
    Thinking of going up to 200w of power totally dimmable. Also looking in too a controller but they cost a bit.
     
    Last edited by a moderator: 26 Nov 2015
  18. Andre@ReefAquatics

    Andre@ReefAquatics Sponsor

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    Using resistors to limit the current is not the optimimum way to as you are not using your supply as a constant current source. So you wasting lots of power that way.

    Resistors also have tolerances so all you leds womt have the same brightness. Visually probably yes.

    Adding a controller to a paralleled config also poses its own problems as each led is a channel. We pwm the duty cycle and not current.

    Shaun your led unit looks awesome and when the controller is added give me a shout to pop around
     
    Last edited: 26 Mar 2014
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