Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
Thanks Paul, would the same apply to the fire wire connector?
"Paul" <nospam@needed.com> wrote in message
news:nospam-1804052246590001@192.168.1.178...
> In article <q1Y8e.5014$gV.3255@lakeread02>, "J.Botelis" <dmts@cox.net>
> wrote:
>
>> Front of case USB plugged into USB header on board. Won't recognize my
>> camera and gives me unknown device warning.
>> Back of case everything works great. Front works with old joy stick.
>> Help!!!
>
> I hope you are aware of the "latchup" problem with Intel ICH4, ICH5,
> ICH5R based motherboards. The problem has to do with plugging in USB
> devices while the computer is running. The end result is the
> Southbridge chip (the ones listed above), gets red hot and dies.
> It gets red hot, because a phantom path has formed inside the chip
> that conducts amps of current, causing destruction of the chip.
> This is basically an Intel design defect, as chips should not
> normally be as sensitive to this problem, as the Intel chips
> appear to be.
>
>
http://tw.giga-byte.com/Motherboard/Support/FAQ/FAQ_456.htm
>
> If you have a USB port that is not functioning properly, do not
> torture it. Either RMA the board and get it fixed. Or, use the
> ports on the back of the computer. Or, for greater safety, use
> a separate PCI USB2.0 card for your USB devices. By using a
> separate PCI card, you no longer gamble by using the
> Southbridge USB ports. (Also, for greater safety, I would
> disconnect the USB wires from the Asus 2x5 USB headers, to
> reduce the chances of induced static discharge into the
> USB headers.)
>
> It is unclear what the failure mechanism is. Whether failure
> is being causes by static discharge into the data lines on the
> USB port, or is somehow related to the power path. I looked
> at an Intel reference schematic, and power to the USB ports
> is switched by a SI4501. That buffers the control path to
> the USB power switch, and likely eliminates the power path
> as the location of the failure. That leaves the USB data
> inputs (D+ and D-) as the path being taken by the static
> discharge. For static to do this, the static discharge can
> either flow straight down the D+ and D- wire, and into
> the Southbridge. Or, the D+ and D- wires can have current
> flow induced into them, by a static discharge flowing in an
> adjacent conductor.
>
> HTH,
> Paul