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DeWalt DCB105 Charger Plate EADP-84EP Not Working: SMD Elements, Converter, Transformer Issues

joy482 6801 4
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  • #1 16700080
    joy482
    Level 9  
    Hello. The charger (type as in the topic) does not work. I checked the smd elements around the converter on the primary side and the / g markings are ok. Secondary side semiconductors also ok. The converter does not work, does not heat up, supply voltage is approx. 13v. Elko on the gretz bridge is charged and holds the voltage for quite a long time, although it should discharge after some time after disconnecting the power supply.
    I analyzed the transformer from the primary side, there are three windings, there is a transition between 1 and 2 and a gap in the third. I do not know if this is the output of the split primary winding and there is a break or it is a screen winding. DeWalt DCB105 Charger Plate EADP-84EP Not Working: SMD Elements, Converter, Transformer Issues
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  • #2 16878947
    nik23
    Level 11  
    Has it been repaired? I have the same problem.
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  • #3 19892424
    BOLO300
    Level 16  
    Hello, I will stick to the topic. I have such a charger and by nibbling this white glue I damaged the zener diode. If someone has such a board, I would be grateful for giving the voltage value of this diode. This diode is marked ZD 31 and is soldered to one leg of the SMD Q31 transistor and the IC32 optocoupler, and it is located next to the C4 capacitor in a heat-shrinkable sleeve and C36, near the 230V input and the fuse.
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  • #4 20000002
    Marek Hałat
    Level 12  
    ZD31 to 83C12
  • #5 21383525
    waleriank
    Level 20  
    Check capacitor C12 47uF/25V
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