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Reactivate USB Port after electrical overload

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    • Both USB ports of a MacBook were dead after a shortage or overload on a Ramps Board that was connected to the Mac via an Arduino Board.

    • Normally Mac OS shows a message that tells you that the USB device got deactivated due to a power surge on that port. In this case the message wasn't displayed. It was later displayed after a reboot. Anyway both USB ports were instantly dead.

    • Here and there in the internet people advise to perform a SMC reset. That was done but didn't help. But you should try the SMC reset first.

    • Make yourself familiar with the pinout of your USB cable. Find the ground (GND) and measure with a multimeter if there is still an connection between both ground pins of the USB ports.

    • Check that there is really no power between ground and the +5V pin of the USB cable.

    • Double check that you have a proper working, good quality desktop power supply. https://en.wikipedia.org/wiki/Power_supp...

    • Set it to +5V DC and double and triple check the power and the polarity with a multimeter.

    • Connect ground of the USB port with ground of the external desktop power supply.

    • Maybe you can use just a usb cable but I preferred to use a cable with a device. I used an FTDI breakout board from sparkfun because there the pins are relatively good accessible.

    • Supply the USB device (I suppose on the port that caused the problem) with 5V from the desktop power supply on the 5V pin of the USB plug.

    • The LEDs on the FTDI light up and it is recognized by the Mac.

    • For whatever reason the second USB port got reactivated, too. It works without the need to provide the connected USB device with external power.

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Axel

Участник с: 04/18/17

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