Magicshine MJ-906B Bike Lamp - Faulty Component Identification

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  • FZG
    Senior Member
    • Sep 2022
    • 117
    • Germany
    #1

    Magicshine MJ-906B Bike Lamp - Faulty Component Identification

    Hi, my neighbor gave me a faulty bike headlamp (Magicshine MJ-906B) and asked if I could have a look at it. I opened it up and saw a blown-up component, likely some kind of transistor. The writing on the component looks like "AG5V" but I can´t seem to find any information on this component. Does anyone know what it could be? Also it seems that someone else had worked on the device before (the battery wire soldering looks bad) but since it worked until recently that´s probably unrelated... Any help would be appreciated.
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    Last edited by FZG; Yesterday, 08:00 AM.
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    • FZG
      Senior Member
      • Sep 2022
      • 117
      • Germany
      #2
      Top leg is connected to BAT+ (ca. 8V)
      Bottom right leg is connected to BAT-
      Bottom left leg is connected to another chip for which I can´t find any information either (labeled "ATC B AV")
      Click image for larger version Name: PXL_20251014_160814322.jpg Views: 11 Size: 222.1 KB ID: 3745040

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