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USB Port Tester Making

By on December 17, 2022
USB Port Tester Making

Standard problem when visiting customer place for computer troubleshooting in laptop & desktop when we connect the pen drive some time it works some time it gives errors some time; USB mouse also some time detects some time not. searching on net I found this circuit diagram for reference. So for simplifying process I made this USB Port tester. I took one broken USB Male connector, 2-nos. 1KΩ Resistors & 5mm LED in Blue /Green/RED color, one each.

usb port tester how to

Now time to process the soldering ……………

how to make usb port tester

making your own usb port tester

Ready after solder. Did you say one LED is Missing??

As per the circuit diagram there are 3 different colors of LED is used.

  1. GREEN for Power OK.
  2. RED is for Error i.e. +5v & Ground is reversed.
  3. Blue – is Data indicator (When you plug the tester you get message on the screen of the computer “USB Device not recognized” & Blue LED Blinks, it indicates data signal is also working.

When I opened my LED Box I found some Bi directional LED (Green & RED color). Hence instead of using two LED (Red & Green) for power line testing I used only one Bi directional LED (Green & RED color), which indicates both the direction of the power. Now is the time to test.

testing usb port tester

On connecting to the USB port Green LED lights up showing power is OK

& Blue LED Blinks with message on computer screen.

how to make your own usb port tester

By the way this project is just for R&D & not having proper housing for this USB dongle. Hence kept it on hold till find the solution.

yogesh panchal

This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.

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Note: You can check his previous repair articles on Battery Eliminator 1.5V To 12V No Power



  1. Parasuraman S

    December 17, 2022 at 9:04 am

    Very innovative and useful circuit! Many thanks for sharing!

    • Yogesh Panchal

      December 17, 2022 at 4:52 pm

      Your welcome! sir.

  2. Albert van Bemmelen

    December 17, 2022 at 2:59 pm

    Small and easy to make useful gadgets are always much appreciated Yogesh! Maybe it helps if you use tiny 1206 or 0805 smd leds to solve the housing problem. Recently I 3D printed a cheap USB cable tester with this housing for me and a good friend: The board is this one.

    • Yogesh Panchal

      December 17, 2022 at 4:53 pm

      Thanks! Albert for sharing the link.

  3. Henrique J. G. Ulbrich

    December 18, 2022 at 8:07 pm

    Undoubtedly we always need practical articles like this. Many thanks for sharing your knowledge and experience.

  4. Yogesh Panchal

    December 20, 2022 at 7:03 pm



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