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red led in smd module

Discussion in 'LEDs and Optoelectronics' started by ali_aam, Aug 3, 2017.

  1. ali_aam


    Aug 3, 2017
    in each of smd module 3 led and resistor are series.
    after 2 or 3 days one of leds turn off but tow other leds remains bright.
    can any one explain this video's and picture.

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Maybe you've destroyed some of the LEDs.

    These don't already to be addressable LEDs, so I'll ignore that as a possibility.

    When you have killed, or nearly killed, a LED then you often find they either don't come on immediately, it require a higher current to turn on, or are unusually dim.

    Since semiconductors tends to fail short circuit, failures tend to cascade.
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