Defective LED lamp

Discussion in 'General Electronics Chat' started by JohnUK21, Jun 25, 2015.

  1. JohnUK21

    Thread Starter New Member

    Dec 23, 2014
    4
    0
    Hello!!!

    Can someone answer the following please:

    If an LED lamp is flickering, is it possible to know without testing if the problem is with the LED or the driver?

    Thank you
     
  2. #12

    Expert

    Nov 30, 2010
    16,298
    6,810
    No.
    Last week, my globe light in the living room began dimming at random times. Can I tell if it's the dimmer without testing anything? Even with nearly 50 years of experience?

    The porcelain end on the bulb had cracked. You can't guess that one even if you're good at this!
     
    Hypatia's Protege likes this.
  3. JohnUK21

    Thread Starter New Member

    Dec 23, 2014
    4
    0
    My first guess for something like flashing would be the LED

    If the driver is faulty it will eirther work or no (meaning the light will be oN or OFF) not flashing

    Is this wrong?
     
  4. #12

    Expert

    Nov 30, 2010
    16,298
    6,810
    Do you want some of the members here guess along with you?
    I guess it's a loose, dirty connection. :)

    We can guess all day, but it's not going to get fixed until you actually look at it with your eyes, and probably some variation of a voltmeter.
     
    Alec_t likes this.
  5. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,770
    970
    LED drivers that I've used do tend to "flicker/flash" when the forward voltage of the LED circuit is outside the output voltage range of the driver..
    And you can measure for that so you have one less guess....
     
  6. dl324

    Distinguished Member

    Mar 30, 2015
    3,244
    622
    Based on the information provided, my guess is that it's not the LED and that the LED is reacting to variations in it's driver current...
     
Loading...