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USB question, those with electrical knowledge. Can I still use this hub?

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  • Power Supplies
  • USB
Last response: in Other Consumer Electronics
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March 12, 2014 1:18:11 PM

Here's my situation:
I got a USB hub from China, and it has an unfortunate circuitry issue in that it feeds power through from its external power supply to the computer (My mobo light remains on despite the PSU not being turned on).


12v 2a DC adapter ---> Hub ---> PC
The problem is that the power from the adapter would flow into the computer from the power supply - or at least, when my actual PSU was unplugged, the Mobo light remained on.

Anyhow, I figure this is kind of not the best thing in the world to have going on. So I decided to do some fiddling around, and since it has its own power supply I figured that cutting the 5v red wire would stop the feedback (since it needs no extra power). It did.

However, now all I have connecting to the computer is a ground, and data+/-. Is that going to burn out the USB port at all, or cause other problems? I've tested it, and the hub works fine since it gets power from an outlet and not the PC, but at the same time I just want to know if there could be any problems if I were to use it.

Again, to recap:
The 5v+/- red wire is CUT. No power seems to flow into or from the PC.
The ground wire is still intact.
The Data+/- wires are also still intact.

Does anyone know if this will be a problem?

More about : usb question electrical knowledge hub

a b ) Power supply
March 12, 2014 1:44:22 PM

Hi
Yeah that will work fine,just ensure that the cut red wire cannot short on anything.
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March 12, 2014 7:37:55 PM

makkem said:
Hi
Yeah that will work fine,just ensure that the cut red wire cannot short on anything.


It's not going to cause port burnout? I just don't want to buy another mobo, hence the double check. My concern is with the grounding wire, but I don't see it doing anything.
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a b ) Power supply
March 13, 2014 2:15:32 AM

It could only cause port burnout if your cut wire was to short on anything,in fact you would be more likely to get port problems with the way it was ie feeding power the wrong way.
The grounding wire is fine as it does not carry any voltage but if you are worried you could cut that as well without any effect.
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March 13, 2014 8:03:58 AM

makkem said:
It could only cause port burnout if your cut wire was to short on anything,in fact you would be more likely to get port problems with the way it was ie feeding power the wrong way.
The grounding wire is fine as it does not carry any voltage but if you are worried you could cut that as well without any effect.


Alright, so I just have to make sure to tape that wire up - as for the ground, strangely enough, it seems that it's required. My system boots as long as the 5v+- is cut, but the port wouldn't function until I stitched the ground back together.
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