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Screwdriver Charger Repair: 23V 400mA Output, 18V Battery, Burned Circuit Board, Transistor & Diode

Rootkit 5661 7
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  • #1 16533171
    Rootkit
    Level 9  
    Hello,

    I got a screwdriver charger for repair, it burned the plate.
    How could I fix it and why did it happen?

    Charger: 23V 400mA, the output is about 34V
    The battery only says 18V, I don't know how much mAh it has.
    A transistor has fallen off on the circuit board, which is applied to the battery, and the paths have burnt under the diode.
    Everything is supposed to be original and it is not known how it happened (after connecting it burned the second plate, because there were two)
    Screwdriver Charger Repair: 23V 400mA Output, 18V Battery, Burned Circuit Board, Transistor & Diode
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  • #2 16533263
    bearq
    Level 39  
    Nobody will answer you how to fix it because you don't know how it happened, you should measure the plate, but from experience I will tell you that buying a new charger from the labo power supply itself will be a cheaper and faster solution, cost around PLN 40.
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  • #3 16533541
    Artur k.
    VIP Meritorious for electroda.pl  
    Rootkit wrote:
    Charger: 23V 400mA, the output is about 34V

    And good, because there is no stabilizer. It should be.

    Draw a diagram of this charger.
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  • #4 16533638
    Rootkit
    Level 9  
    The power supply is 4 diodes and a 470uF / 50V capacitor, and what is superimposed on the battery looks like this:
    Screwdriver Charger Repair: 23V 400mA Output, 18V Battery, Burned Circuit Board, Transistor & Diode
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  • #5 16533649
    Artur k.
    VIP Meritorious for electroda.pl  
    Are all the diodes in the rectifier of the power supply OK? The battery is not damaged?
  • #6 16533681
    Rootkit
    Level 9  
    Yes, the diodes have been checked, they are OK, the battery works.
  • #7 16533934
    mariann
    Level 38  
    Hello
    Rootkit wrote:
    the battery is working

    So what's the tension on it? "
    Scheme not drawn correctly. What is this element at the very bottom of the diagram?
    Regards
  • #8 16533973
    Rootkit
    Level 9  
    About 14V without load, after connecting the 12V fan it drops to about 9V.
    It was supposed to be this small transistor visible in the first picture, signed on the board Q1.
    I just didn't know how to check if it's NPN or PNP, there are no markings on the housing.
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Topic summary

A user seeks assistance in repairing a screwdriver charger that has a burned circuit board. The charger outputs 23V at 400mA but is producing around 34V. The battery is rated at 18V, and a transistor has fallen off the circuit board, with burnt paths under a diode. Responses suggest checking the power supply's diodes and the battery's condition, with one user recommending purchasing a new charger as a potentially cheaper solution. The user confirms that the diodes are functional and the battery is operational, providing voltage readings of 14V without load and 9V under load. The user is uncertain about the type of the fallen transistor (NPN or PNP) due to a lack of markings.
Summary generated by the language model.
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