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Case grounding problem with front USB ports

Last response: in Components
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March 19, 2013 11:01:31 PM

Hi all,

I think I have an issue with my case and the way the components are grounded...

Fractal Design Define R4, steel case with plastic front. The front (top) USB ports (2x USB 3.0 + 2x USB 2.0) are in the plastic part. Motherboard is a Gigabyte GA-MA790XT-UD4P. NEC(Renesas)-based PCIE USB 3.0 card installed.

Whenever I plug a device into any of the ports, the computer will hard reset, as if I pushed the reset button. UNLESS I am touching the metal part of the case with my free hand, then all is fine.

Anyone seen this before? Any suggested remedies?

Thanks!
March 19, 2013 11:30:18 PM

look to see if the case vendor has bent pins on the usb port or is missing the spacers. also look to see if there a daughter board used for the usb ports...a lot of times if it not a grounding issues is a misswire on the connectors. take a look at online usb wiring wiki.
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March 20, 2013 10:28:49 AM

Thanks for the reply. That's what I had thought at first, so I had Fractal send out a new front USB port assembly. No dice - it still had the same issue. The USB 2 ports are connected via a small daughterboard to which the USB 3 port connector is glued (no electrical connection).
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March 21, 2013 3:22:14 PM

did you use and rubber spaces on your standoff screws??in real life those silver screws are the ground points of the mb.
also check that the wall outlet is grounded. starts from the wall..into the power supply then the mb. the other thing to check is see if the usb cables are wired right.
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!