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I need help to repair my DroK buck converter 2018-04-27T14:35:05+00:00

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  • Abdal
    April 27, 2018 at 2:35 pm
    Post count: 0
    #29665 Reply |

    Hello,

    I am a student in electronics at CÉGEP Gérald-Godin in Québec and I will graduate to become electronics technician in 2 years from now. I have bought from Amazon Canada an adjustable buck converter with display. Here’s the name and link :

    DROK® DC-DC Adjustable Buck Voltage Converter Stabilizer 6-32V to 1.25-32V LCD Display Constant Volt Amp 6V 12V 24V Step Down Voltage Regulator Power Module with USB Port Protective Shell

    https://www.amazon.ca/gp/product/B01FQH4M82/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

    the device was working great and I used it to charge Li-ion batteries one cell by cell and activate other DC devices. The problem start when my little sister moved badly the buck converter then I realize that Vin+ cable was disconnected from its place and connected directly to multiple components on the board and now the buck converter doesn’t work at all.

    I need help to find the problem. If you have any troubleshooting documents with step by step that will help me a lot. I have basic knowledge in electronics like Ohm’s law, Kirchhoff’s laws open circuit, short circuit, TTL NPN PNP MOSFET transistors, resistor, LEDs.

    Best regards,

    Abdal

    Drok
    Keymaster
    April 28, 2018 at 10:01 am
    Post count: 2971
    #29670 Reply |

    Hello Abdal,
    Would you please tell us more details? For example, how it is now? Can’t it power on again?
    If the cable is connected to other components, is there short circuit?
    Best regards.

    Abdal
    April 29, 2018 at 7:56 pm
    Post count: 0
    #29675 Reply |

    Hello,

    Now the device doesn’t work at all and the screen too doesn’t work. It doesn’t seem to be a short circuit because the device doesn’t heat when I plug it. Maybe an open circuit is causing the problem. Which component should I verifie and change?

    Thank you for your help,

    Abdal.

    Abdal
    May 1, 2018 at 9:38 pm
    Post count: 0
    #29680 Reply |

    I am still waiting for an answer…

    Drok
    Keymaster
    May 2, 2018 at 9:55 am
    Post count: 2971
    #29689 Reply |

    Hello Abdal，
    Due to the May Day, we are sorry we can’t reply on time.
    Did you plug it again to check the heat after broken?
    We are sorry it is hard to check problem with limited information. We suggest you can firstly check the parts that was connected mistakenly with Vin+ cable.
    Best regards.

    Abdal
    May 3, 2018 at 5:02 pm
    Post count: 0
    #29694 Reply |

    Hi,

    I checked that device and after some reserch for datasheet, I found that it’s a NPN Transistor. so I verified the voltages on each pin and I descovered 10V between the base and emitter so I changed that componant and now the buckconverter works well.

    thank you for advice,

    Abdal

    Drok
    Keymaster
    May 4, 2018 at 10:04 am
    Post count: 2971
    #29696 Reply |

    Dear Abdal,
    It’s glad you have figured out it.

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