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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. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    What is the voltage at the micro USB connector with no load connected? Sometimes the output voltage of a not well designed power supply may be much higher than the nominal value when no load is connected. If you then connect this supply to a load, the output voltage will drop to the nominal value but the initial value being too hihj may already have caused havoc.
     
  2. Fractus

    Fractus

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    Dec 31, 2020

    5.37v
     
  3. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    That is reasonable and no cause for concern.
     
  4. Fractus

    Fractus

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    Dec 31, 2020

    Ok, but why it ruined my JBL Go and powerbank !!!
     
  5. Martaine2005

    Martaine2005

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    May 12, 2015
    Can you please answer post #19.
    The answer may be there.

    Martin
     
  6. Fractus

    Fractus

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    Dec 31, 2020
    White is instead of black (negative)
     
  7. Martaine2005

    Martaine2005

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    Yes, I understand that.
    But did you connect ‘BLACK’ first as negative, like your first drawing?.

    Martin
     
  8. Fractus

    Fractus

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    Dec 31, 2020

    Yes I did as per my photo post #15
     
  9. Martaine2005

    Martaine2005

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    May 12, 2015
    WHITE is Data - (negative)
    BLACK is signal - (negative)
    Did you connect the devices when you had the WHITE as - (negative)?

    Martin
     
  10. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    It is getting confusing: the image in post #15 shows a white wire, not a black one.

    @Fractus : help us sort this out:
    • How many wires are in that cable from the power supply?
    • What are the colors of these cables?
    • How did you connect the cables to the micro USB plug?
    • If there are more than 2 wires in the cable, have you swapped any of them?
    • Which measurements have you made and what were the results?

    Please give us a comprehensive and concise explanation. It is hard to follow along when information comes piecewise and partly contradictory.
     
    Martaine2005 likes this.
  11. Fractus

    Fractus

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    Dec 31, 2020
    1. There are two wires from the power supply - see post #15 (white wire replaces black I presume......please note I'm new to electronics)
    2. The only colours from power supply are red and white.
    3. Connection of cable to micro USB see post #15.
    4. Cannot understand your comment on measurements !!!

    Thanks!!!
     
  12. Fractus

    Fractus

    18
    0
    Dec 31, 2020
    Yes
     
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