LED bulb - some rows not working

Discussion in 'General Electronics Chat' started by foghornbg, Oct 29, 2015.

  1. foghornbg

    Thread Starter New Member

    Oct 29, 2015
    1
    0
    Hello,

    I have bought led bulb with 69 SMD LEDs and they are arranged in 10 rows of 6 LEDs and on top 6 more LEDs.
    Suddenly, some rows went off, but if i take 12V to that row with LED driver, they work.

    So the conclusion is that LEDs are OK, but something else might need replacement, any ideas?
     
  2. JWHassler

    Member

    Sep 25, 2013
    201
    33
    Current limiting resistor(s)?
     
  3. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,805
    1,105
    Welcome to AAC!
    More details needed. Post a schematic if you can, or a link to the product or its datasheet/spec.
     
  4. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,771
    971
    shorts, cold solder joints, cut traces,etc...
     
  5. dl324

    Distinguished Member

    Mar 30, 2015
    3,250
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    Is it still under warranty?
     
  6. #12

    Expert

    Nov 30, 2010
    16,343
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    If it's all surface mount and it's all on one side, a photo might be enough.
     
  7. shiva007nand

    Member

    Sep 25, 2015
    38
    1
    You have mentioned Total 69 LEDs
    10 rows of 6 LEDs will make 60 LED, on top 6 will make it 66 LEDs
    where are remaining 3 LEDs ??
     
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