Can't Use Onboard USB On P4C800 E Deluxe???

  • Thread starter Thread starter jayson
  • Start date Start date
J

jayson

Is this the situation? What the ****...? So what happens if you use
them? Is there a work around or bios update for this?
 
It is a problem with static electricity. A static discharge
into a Southbridge USB port, appears to cause what is called
"latchup failure". That causes the Southbridge to burn.

http://www.abxzone.com/forums/showthread.php?t=84122&highlight=usb+port

http://tw.giga-byte.com/Motherboard/Support/FAQ/FAQ_456.htm

Paul
Click to expand...


I use my P4C800-E Deluxe USB ports without any problems
(since July 2004). But I'm very careful about static
electricity and my computer is "grounded" properly.
http://users.tkk.fi/~then/mytexts/ungrounded_pc.html
 
I use my P4C800-E Deluxe USB ports without any problems
(since July 2004). But I'm very careful about static
electricity and my computer is "grounded" properly.
http://users.tkk.fi/~then/mytexts/ungrounded_pc.html
Click to expand...

But there is more to this problem than meets the eye.

Normal ICs are considered to be doing well, when they have
1KV ESD resistance. In a paper on the Intel site, Intel claims
they know how to make I/O pads with 8KV ESD resistance.

I've seen one errata for an Intel chip, involving some kind
of inrush current on I/O pins. Southbridge chips can have
complicated power issues, due to multiple power supplies,
and the presence of the 3VSB power from the CMOS battery.
There could be a short lived transient condition during
POST, where the I/O pins are being tortured, and we'd never
know it. (I.e. It doesn't have to be a static problem.)

If Intel were to admit to the problem, and explain the
mechanism, I could tell you with some confidence whether
a separate USB2 PCI card would help. We don't know for
certain that it is static electricity, as at least one
report claimed a failure during a reboot (and, one assumes,
no fiddling with USB connectors during the reboot). The
majority of reports involve plugging USB devices, but since
both front and rear USB ports cause failures, the rear
ports have good grounding on their shields, and most of the
ESD should be going into the chassis (only a little
coupled into the signal wires). When the USB connector is
inserted, the shields are the first thing to make
contact.

As users, we cannot isolate the root cause, without a lot
more reports of what each user did before the motherboard
died. My suggestion is aimed at eliminating all the easy
causes of the problem - but if there is some other sneak
path inside the chip, that is torturing the USB I/O pads,
I'll just have to wait for someone who was religiously
using their USB2 PCI card, to report what happened.

I have one of these boards too, and I don't want to
contemplate what happens when the warranty runs out.

Paul
 
I have one of these boards too, and I don't want to
contemplate what happens when the warranty runs out.
Click to expand...

You get a report here if my P4C800-E Deluxe get any problem.
I continue to use my USB ports. My PC is normally running 24/7.
 
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