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5v - 2A power supply causing damage

Discussion in 'Power Electronics' started by Fractus, Dec 31, 2020.

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  1. Fractus

    Fractus

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    Dec 31, 2020
    I have tried a 5V - 2A power supply on JBL Go and Trust power bank and they are not working now.

    Are they damaged?
     
  2. bertus

    bertus Moderator

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    Nov 8, 2019
    Hello,

    Did you connect the powersupply on the input (charge port) of the powerbanks?
    You can NOT connect it to the outputs.

    Bertus
     
  3. Fractus

    Fractus

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    Dec 31, 2020
    I have connected to the input - micro usb.
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    The JBL Go is a portable speaker, not a power bank.
    Please explain in more detail which devices you connected in which manner. A schematic will be of great help. You don't have to use fancy software for that. Make a sketch with pencil on paper and upload a photo (note size limit is ~ 300 kB!).
    Also a more detailed explanation of "not working now". What are the symptoms? Do you notice any visual or audible effects?
     
  5. Fractus

    Fractus

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    0
    Dec 31, 2020
    Actually, I had an unused power supply 5V 2a and I soldered a micro usb and tried it to charge JBL Go and Trust Urban powerbank and somehow they stopped functioning. I had a reading of 5.37v on the multimeter. What possibly went wrong?!
     
    Last edited: Dec 31, 2020
  6. Harald Kapp

    Harald Kapp Moderator Moderator

    10,833
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    Nov 17, 2011
    5.37 V is o.k. vor a 5 V port. Not too high to fry components if the polarity is correct.
    Wrong polarity? You may have swapped plus and minus. Imho the most likely case.
    Or the power supply may have a low quality output with overshoots much higher than 5 V which may not show on your meter but can be deadly for the electronics. Which pinout did you use for the micro USB plug?
     
  7. Fractus

    Fractus

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    Dec 31, 2020
    The polarity was correct, quality of the power supply I doubt, the power supply wire was a bit thick.

    I am a newbie what do you mean pinout?
     
  8. bertus

    bertus Moderator

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  9. Fractus

    Fractus

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    Dec 31, 2020
    JBL Go is red model (as your link) and Trust powerbank is URBAN.
     
  10. bertus

    bertus Moderator

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    Nov 8, 2019
    Hello,

    Did you try to reset the JBL?
    Turn the JBL GO on Press and hold the Volume + and the Bluetooth button simultaneously for 3 seconds
    The JBL GO will turn off and has now been reset.

    Bertus
     
    Harald Kapp likes this.
  11. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    The assignment of pins and signals or voltages (example).
     
  12. Fractus

    Fractus

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    Dec 31, 2020
    Assignment of pins as thumbnail
     

    Attached Files:

  13. Fractus

    Fractus

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    Dec 31, 2020
    I tried that and also connected another battery but all in vain.
     
  14. Harald Kapp

    Harald Kapp Moderator Moderator

    10,833
    2,442
    Nov 17, 2011
    The pinout looks o.k. My guess is that your power supply is bad. But can't say for sure. One would have to analyze the defects and also the output of the power supply.
     
  15. Fractus

    Fractus

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    Dec 31, 2020
    MicroUSB.JPG AC adapter.JPG
     
  16. bertus

    bertus Moderator

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    Nov 8, 2019
  17. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Assuming red = "+" and white = "-" the connections visually do look o.k., cf. here.
    @Fractus : have you verified by measuring that the color coding matches the above polarity? Color coding usually is a good indicator, but not 100 % reliable.
    Are you sure there is no short circuit between pins 1 (+) and 3 (D+, center)? USB data is 3.3 V only. A short circuit to 5 V may have damaged the electronics (although a well designed circuit should have some sort of protection against this case).
     
  18. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,449
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    Jan 21, 2010
    My guess is that the 5V was connected around the wrong way (pinout notwithstanding). My further guess is that they units have a diode across the power inputs and this has now failed short circuit.

    Measure the resistance across the power pins of the dead devices, and if you read 0 ohms both ways, then you have a diode inside to find and replace.

    However, the other option is as indicated above. I have a genuine apple charger that killed 3 of my devices before I twigged that it was the common factor.
     
  19. Bluejets

    Bluejets

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    Oct 5, 2014
    Pencil diagram shows red and black as power......photo shows red and white..????
     
    Martaine2005 likes this.
  20. Fractus

    Fractus

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    Dec 31, 2020

    The multimeter read the red wire is positive
     
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