Topic | Magic Blue Smoke (and flat batteries)

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This topic contains 1 reply, has 2 voices, and was last updated by  James 11 months, 2 weeks ago.

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  • #19640 Reply

    Guy

    I was suffering from the constant flat battery issue despite de-burring the clips.
    Put ANOTHER set of new batteries in and could small hot electronics! Had a thermal camera handy so looked. The 6 leg component near the GND and DT test points was red hot! Then a nearby track/via on the PCB went brown and bubbled up! I took the batteries out quickly.
    There were no leads connected to the meter, just had new batteries and blue smoke came!!!!!

  • #19660 Reply

    James
    Keymaster

    Hi Guy,

    Thanks for the description. I think the part you’re describing is this one:

    Which is part of this circuit:

    This is there to protect the meter from the batteries being reversed. Clearly this component has failed on your PCB, and it sounds like it has failed in a short circuit. This should not have happened. Email me with shipping info and I’ll get you a replacement. Or if you’re comfortable soldering and want to attempt a repair, the rest of the circuit might be intact: remove the offending component and bridge across these pads:

    This will bypass the reverse battery protection. Best
    ~James

    • This reply was modified 11 months, 2 weeks ago by  James.
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