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HELP: Front Panel Static Discharge Issue

post #1 of 19
Thread Starter 
Okay OCN, it's time for me to ask for your help.

The Scenario:
About a month ago, my company began building and selling custom-built desktop PCs to fill a need for our existing clients. The weather recently turned cold, and we've been getting a lot of static electricity buildup. It's been reported several times that plugging a USB device into the systems would cause them to blank the screen, reboot, or shut off.

The Specs:
CoolerMaster Elite 430 Black
ASUS M4A88T-M
Corsair CX430 PSU
Phenom2 955 or Athlon2 255
G.Skill Ripjaws
Corsair Force3 SSD/WD Black 1TB

The Tests:
Holding the end of a USB cable, I walk 10 ft on carpet and touch the cable connector to the edge of the USB port. System shuts off. Repeated test on three other cases with very similar hardware, none of them experienced the same issue.

The Attempted Fix:
http://yfrog.com/nwk9lzmj
I tried to ground out the metal surround on the USB header by attaching an alligator clip to it and running two wires to a ground screw I attached to the case (sanded paint away and everything). Unfortunately, this (a) didn't work and (b) increased sensitivity to static when discharged on the front of the case, which means it was made worse by sharing a common ground.

The Theory:
It seems that the front panel connectors on these cases are of subpar quality. Maybe a ground isolation issue, whereby the static current jumps into the wires that are supposed to carry data?

The Plead:
I need your help. Ideas, theories, etc. I make a living at being the best at what I do, and a problem like this is not what I'd consider "the best". Worst case scenario (ha!) I'd have to swap cases, but that's a lot of work and a huge inconvenience to my clients. I'd prefer to devise a fix I can roll out to the existing systems and implement in future ones.

Thanks, guys. thumb.gif

PS: It's noteworthy to say that I always tap the side of the case before I plug in any device or work on a system. For this reason, I never noticed nor encountered the issue here. This fix is for the systems used by my clients, many of whom do not wish to tap the case each time they plug in a device.
Edited by Xyro TR1 - 10/20/11 at 11:56am
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post #2 of 19
Wild guess:

Buy one of those ferrite cores from eBay or Radioshack and clip/loop it onto the USB front panel wiring. They shield EMI and whatnot, I THINK they work on supressing static discharge.
    
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post #3 of 19
Thread Starter 
Quote:
Originally Posted by clickhere.exe;15383398 
Wild guess:

Buy one of those ferrite cores from eBay or Radioshack and clip/loop it onto the USB front panel wiring. They shield EMI and whatnot, I THINK they work on supressing static discharge.

Thanks for the input! However, Ferrite beads are only useful in removing EMI, not ESD.
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post #4 of 19
Quote:
Originally Posted by clickhere.exe;15383398 
Wild guess:

Buy one of those ferrite cores from eBay or Radioshack and clip/loop it onto the USB front panel wiring. They shield EMI and whatnot, I THINK they work on supressing static discharge.

That wont work for ESD though...
and typically static build up increases in heat, not cold... very odd.

Instead of being a negative nancy, i wish i had a solution to offer, but the alligator clip would have been my best guess... only other way i can think to diagnose this issue would be to attach the other end of the clip to an actual ground rather than to the case.
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post #5 of 19
This is interesting. My 902 has a wire that screws to the case, while my CM Centurion 5 has a Ferrite ring. I know a couple times I've had my 902 reboot when I tried to plug something in, but it's not a regular occurrence. Good luck getting this sorted out. smile.gif
post #6 of 19
ESD can get worse when it gets cold because it tends to be alot less humid

the only time I can recall ever seeing a buildup of ESD in a case was when I ran an old rig on a wall socket that wasn't grounded properly
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post #7 of 19
I had the same issue with my antec 1200 and the front usb ports. It seemed to have fixed itself though.
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post #8 of 19
Everything grounds out through the PSU. The motherboard screws ground the case, the board, and the connected devices through the ATX 20/24 pin connector.

I have seen problems such as this occur when using painted screws that have lost their conductivity to hold the motherboard down, as well as with just poorly ( ineffectively ) grounded buildings and some insanely cheap PSU's.
post #9 of 19
Thread Starter 
Quote:
Originally Posted by kingpin4329;15383446 
That wont work for ESD though...
and typically static build up increases in heat, not cold... very odd.

Instead of being a negative nancy, i wish i had a solution to offer, but the alligator clip would have been my best guess... only other way i can think to diagnose this issue would be to attach the other end of the clip to an actual ground rather than to the case.
Alas, I do not have a *true* ground here in my office. I'm going to try using one of those rear-mount USB header things that fit in the card slots and see if that achieves the same result when shocking. Thanks for the input!
Quote:
Originally Posted by t-ramp;15383483 
This is interesting. My 902 has a wire that screws to the case, while my CM Centurion 5 has a Ferrite ring. I know a couple times I've had my 902 reboot when I tried to plug something in, but it's not a regular occurrence. Good luck getting this sorted out. smile.gif
That's interesting... I'll share my findings and maybe you can solve your issue too! thumb.gif
Quote:
Originally Posted by selectstriker2;15383485 
ESD can get worse when it gets cold because it tends to be alot less humid
Indeed, this combined with wearing more and heavier clothing and using the heater means that static buildup increases substantially. smile.gif
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post #10 of 19
Thread Starter 
Quote:
Originally Posted by gorb;15383499 
I had the same issue with my antec 1200 and the front usb ports. It seemed to have fixed itself though.
o.O Well that's odd. I'm not going to bet on this fixing itself, though. tongue.gif
Quote:
Originally Posted by Xinoxide;15383509 
Everything grounds out through the PSU. The motherboard screws ground the case, the board, and the connected devices through the ATX 20/24 pin connector.

I have seen problems such as this occur when using painted screws that have lost their conductivity to hold the motherboard down, as well as with just poorly ( ineffectively ) grounded buildings and some insanely cheap PSU's.

Interesting... I did try alligator-clipping to the PSU fan grate (painted black mad.gif ) and it still shut off. I will try replacing the mobo screws with silver metal screws and see if that helps the situation. The building does have the crappiest wiring, however this has not been an issue with any other system configuration.
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Corsair K70 RGB (MX Brown) Corsair HX750 Silverstone Precision PS07B-W Logitech G500 
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Ponybutt Creative X-Fi Titanium HD JBL D38 Bookshelf Speakers Pioneer S-P570 Bookshelf Speakers 
AudioAudioOtherOther
Audiosource EQ Eight II Audiosource AMP-100 NZXT white LED lighting NZXT Sleeved Cabling 
OtherOther
Kensington Monitor Stands AverMedia HD USB DVR 
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Barkbox
(16 items)
 
Barktop
(9 items)
 
 
CPUMotherboardGraphicsRAM
Intel Core i7-7700K Asus Z170I PRO GAMING Asus GeForce GTX 1070 8GB G.Skill Ripjaws V Series 32GB DDR4-3000 
Hard DriveHard DriveCoolingOS
Samsung 950 PRO 512GB M.2 SSD Crucial MX300 1TB SATA3 SSD Noctua NH-L9I Windows 10 Pro 64-bit 
MonitorMonitorMonitorKeyboard
23" Dell P2314H IPS 23" Dell P2314H IPS 23" Dell P2314H IPS Corsair K70 RGB 
PowerCaseMouseOther
Corsair SF450 Fractal Design Node 202 Logitech G502 Intel 7265NGW Wireless 
CPUGraphicsRAMHard Drive
i7-4700HQ NVIDIA GTX 860m 2GB 16GB Crucial DDR3-1600 1.35v 480GB Intel 730 SSD 
Optical DriveOSMonitorMouse
External Lenovo DVD-RW Windows 10 Pro x64 15.6" Multitouch Logitech G602 
Other
Lenovo Y50 (59426255) 
CPUMotherboardGraphicsRAM
i7-3770k @ 4.7Ghz ASUS MAXIMUS V GENE Z77 MSI R9 290X GAMING 4G 32GB G.Skill Ripjaw Z DDR3-2133 
Hard DriveHard DriveHard DriveCooling
256GB Samsung 840PRO in RAID0 256GB Samsung 840PRO in RAID0 3TB Seagate Barracuda HDD Corsair H80i 
CoolingCoolingCoolingOS
Corsair SP120 Quiet fans push/pull GeLid GC-Extreme Corsair AF120 Quiet White fans (pair) Windows 10 Pro x64 
MonitorMonitorMonitorMonitor
23" Dell P2314H IPS (eyefinity) 23" Dell P2314H IPS (eyefinity) 23" Dell P2314H IPS (eyefinity) 19" ASUS VH196 
KeyboardPowerCaseMouse
Corsair K70 RGB (MX Brown) Corsair HX750 Silverstone Precision PS07B-W Logitech G500 
Mouse PadAudioAudioAudio
Ponybutt Creative X-Fi Titanium HD JBL D38 Bookshelf Speakers Pioneer S-P570 Bookshelf Speakers 
AudioAudioOtherOther
Audiosource EQ Eight II Audiosource AMP-100 NZXT white LED lighting NZXT Sleeved Cabling 
OtherOther
Kensington Monitor Stands AverMedia HD USB DVR 
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Reply
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Overclock.net › Forums › Case Mods & Cases › Computer Cases › HELP: Front Panel Static Discharge Issue