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SOLVED One led has opposite color

Discussion in 'Hardware Support' started by Andrey Popov, 8 October 2016.

  1. Andrey Popov

    Andrey Popov New Member

    Messages:
    22
    Hardware:
    RPi2, +Arduino
    Led: WS2801 (32+15 leds)
    Power Supply: 3A 5V
    RPI 2

    I had flickering problem, but it was solved by soldering all wires. External 5v connected to RPI GND.

    So here is my problem:
    IMG_3824.JPG
    I set red, all leds are red - then 1 sec later, this led changes his color to opposite
    If blue - it became red and etc.
    I noticed, that if I use half brightness, led stays in correct color.
    All other leds look stable, but this one flashes quickly with different colors.
     
  2. Brindosch

    Brindosch Administrator Administrator

    Messages:
    679
    Hardware:
    RPi1/Zero, RPi2, RPi3, +nodeMCU/ESP8266
    Greetings,
    sounds like a damaged chip, could you replace this segment?
     
  3. Andrey Popov

    Andrey Popov New Member

    Messages:
    22
    Hardware:
    RPi2, +Arduino
    I have to try(

    There is another big problem:
    1) Red was one
    2) then I stopped Hyperion
    3) after 10 minutes, I saw, that there are several white flashing leds. -> I removed power and all wires from RPI
    4) nothing works )) Connect wires, give power. Only 1st led flashes white.

    Is it possible, that all led strip was damaged? how to diagnose led strip and each led?
     
  4. penfold42

    penfold42 Moderator Developer

    Messages:
    742
    Hardware:
    RPi1/Zero, RPi2, RPi3, 32/64bit, +Arduino, +nodeMCU/ESP8266
    Which led was having the issue ?
    1st in the strip ?
    Middle of the strip ?
    Last in the strip ?

    Do you have a level shifter ?

    Have you measured the 5v led supply ?
     
  5. Andrey Popov

    Andrey Popov New Member

    Messages:
    22
    Hardware:
    RPi2, +Arduino
    1st led in the second part (first part has 15 leds, second - 32)
    I dont have level shifter
    I measured power supply, it gives 5.12v - 5.16v
     
  6. Andrey Popov

    Andrey Popov New Member

    Messages:
    22
    Hardware:
    RPi2, +Arduino
    Here is my power supply. 15W in enough for 2 meters. (In my case 1.5m)
    1123.png
     
  7. penfold42

    penfold42 Moderator Developer

    Messages:
    742
    Hardware:
    RPi1/Zero, RPi2, RPi3, 32/64bit, +Arduino, +nodeMCU/ESP8266
    I would look closely at the solder joints between the strips
     
  8. Andrey Popov

    Andrey Popov New Member

    Messages:
    22
    Hardware:
    RPi2, +Arduino
    Do not judge me)
    111.png
     
  9. Andrey Popov

    Andrey Popov New Member

    Messages:
    22
    Hardware:
    RPi2, +Arduino
    Solved!

    Really bad chinese power supply. Was changed to another 12V with DC-DC step down.
    Re-soldered all segments.