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LED Christmas Tree Lights: Glowing Instead of Shining, Diagnosing Potential Element Issue

sebc 17202 9
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #2 16247644
    miecho18
    IT specialist  
    It is a bridge rectifier (Graetz). Check it with a meter.
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  • #3 16247647
    Witold5
    Level 32  
    It's just a rectifier. Damaged, replace.
  • #4 16251722
    sebc
    Level 10  
    Thanks for the answers, I checked the bridge with a multimeter, it looks like it's working at the output is 220v. In that case it's probably one of the diodes. How to find the damaged one?
  • #5 16252136
    Gismot
    Level 18  
    sebc wrote:
    In that case it's probably one of the diodes. How to find the damaged one?

    yes, it would be best to check each diode separately. Alternatively, look at them under a magnifying glass, usually blown out will be visible, but not always.

    Generally these lights are terrible crap. In this system LEDs will not last long - no power source. It's enough if you have garbage in the network or too high voltage and as a result the LEDs will overheat / burn.
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  • #6 16252223
    Rezystor240
    Level 42  
    These LEDs are production waste swept from the floor, it is not worth repairing.
    If one burns out and we make a jumper instead, the other diodes will automatically receive more voltage, which will shorten their poor life.
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  • #7 16252409
    Witold5
    Level 32  
    Everyone writes that this is rubbish, not the author had a question. You have no other option but to check each one individually. The simplest method is to prick a meter or a battery with these pins. Of course, disconnected from the mains voltage.
  • #8 16252863
    radelek
    Level 10  
    Hello. Do as Witold5 writes, which is a bit laborious. I took each evening
    diode separately in hand and I checked carefully if I finally found one that did not
    glowed. After replacing it all lit up normally. Regards
  • #9 16279519
    sebc
    Level 10  
    Is the battery enough? Do you need any resistor? 9v battery or other?
  • #10 16279542
    Rezystor240
    Level 42  
    sebc wrote:
    Is the battery enough? Do you need any resistor? 9v battery or other?

    A 3V battery is enough.
    Like 9V is a resistor around 300?, the maximum current is 0.030A just for a single diode.
    I did not count the source (battery) resistance.
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Topic summary

The discussion revolves around diagnosing an issue with LED Christmas tree lights that have transitioned from shining brightly to merely glowing. Users identified the component in question as a bridge rectifier (Graetz) and suggested checking it with a multimeter. After confirming the rectifier's output voltage, the focus shifted to testing individual diodes for failure. Recommendations included using a multimeter or a low-voltage battery (3V) to test each diode, with caution advised regarding the potential for increased voltage to other diodes if one is bypassed. Some participants expressed skepticism about the quality of the LEDs, suggesting they are poorly manufactured and not worth repairing.
Summary generated by the language model.
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