I have an issue that is so weird that I've gave up googling for it,
before I even started. My excuse for using this newsgroup is that I have
an ASUS Motherbord, M2NPV-VN, and I have gotten some good answers here in
the past. But I don't really hold the motherboard as the culprit.
The issue is that occasionally when I am to plug in a USB device using the
front connection of my computer case and fiddle around to find my way,
the computer powers off instantly. This has happened three times now over
a period of couple of months. Last night when it happened, I had to pull
out the power cable for some seconds to be able to turn on the computer
again.
The case is Antec Sonata II, but the power supply is from Corsair, as I
had to replace two bad power supples from Antec. The operating system is
Vista Ultimate x64 SP2, although I find difficult to believe that that
matters.
Erland Sommarskog wrote:
> I have an issue that is so weird that I've gave up googling for it,
> before I even started. My excuse for using this newsgroup is that I have
> an ASUS Motherbord, M2NPV-VN, and I have gotten some good answers here in
> the past. But I don't really hold the motherboard as the culprit.
>
> The issue is that occasionally when I am to plug in a USB device using the
> front connection of my computer case and fiddle around to find my way,
> the computer powers off instantly. This has happened three times now over
> a period of couple of months. Last night when it happened, I had to pull
> out the power cable for some seconds to be able to turn on the computer
> again.
>
> The case is Antec Sonata II, but the power supply is from Corsair, as I
> had to replace two bad power supples from Antec. The operating system is
> Vista Ultimate x64 SP2, although I find difficult to believe that that
> matters.
>
Look for the USBPW56 or USBPW78 jumper header in the manual. The front
USB ports, will be connected to USB56 or to USB78. Set the corresponding
power control header to "+5V (default)". This header is a block of 2x3
pins, with two jumpers. One jumper controls each interface. The USBPW78
could be the top row of three pins. The USBPW56 could be the bottom
row of pins. The power setting likely affects both USB interfaces on
the 2x5 header block.
X <--> X X <--- USBPW78 1x3 row of pins
X <--> X X <--- USBPW56 1x3 row of pins
+5V
(Default)
That will cause the front USB connector, to operate from the +5V rail,
which has more power to offer. See if that helps.
When a computer shuts off suddenly, that could be caused by shorting
+5VSB to ground. If you change the power option for the USB interface,
to run from +5V instead, then that should help the power supply deal
with the load. +5VSB may have a power rating of 2 amps, while
+5V may have a rating of 20-25 amps.
The problem could be related to the capacitor near that USBPW56 or USBPW78
interface. A small capacitor, like 100uF, is supposed to be provided, as a
local power store for USB, and that is supposed to prevent what is
happening to you. And looking at the picture of the motherboard here,
I see that such capacitors are present. I see them near the CMOS
battery area. There are two 2x5 headers, one capacitor just above the
two headers, one capacitor to the right of the lower header. The
USBPW56/USBPW78 jumper blocks, are in between the two 2x5 headers.
So it looks properly designed. There are two Polyfuses (permanent fuse type),
located to the right of the top 2x5 USB interface. That fuse limits long term
power flow to about 1 amp total for the two interfaces on a 2x5 USB header.
One fuse goes to each 2x5 header, limiting power flow.
Paul (nospam@needed.com) writes:
> Look for the USBPW56 or USBPW78 jumper header in the manual. The front
> USB ports, will be connected to USB56 or to USB78. Set the corresponding
> power control header to "+5V (default)". This header is a block of 2x3
> pins, with two jumpers. One jumper controls each interface. The USBPW78
> could be the top row of three pins. The USBPW56 could be the bottom
> row of pins. The power setting likely affects both USB interfaces on
> the 2x5 header block.
Thanks Paul! It's certainly a bit advanced for me, so I will have to do
this with care. I will also wait until I get a maintenance window for
my machine - it's takes far to long time to boot, so I avoid rebooting
if I can.
I have not been able to reproduce the problem at will, so it will be
difficult to tell directly whether it will help. But I will give it
try.
I would GUESS that you are causing a dead short from the USB power line
(one of the USB port's 4 pins is +5 volts power) to ground, and the
power supply is shutting down. It's just a guess, however.
You could have a bad USB socket on your case that could cause this.
Erland Sommarskog wrote:
> I have an issue that is so weird that I've gave up googling for it,
> before I even started. My excuse for using this newsgroup is that I have
> an ASUS Motherbord, M2NPV-VN, and I have gotten some good answers here in
> the past. But I don't really hold the motherboard as the culprit.
>
> The issue is that occasionally when I am to plug in a USB device using the
> front connection of my computer case and fiddle around to find my way,
> the computer powers off instantly. This has happened three times now over
> a period of couple of months. Last night when it happened, I had to pull
> out the power cable for some seconds to be able to turn on the computer
> again.
>
> The case is Antec Sonata II, but the power supply is from Corsair, as I
> had to replace two bad power supples from Antec. The operating system is
> Vista Ultimate x64 SP2, although I find difficult to believe that that
> matters.
>
In article <Xns9CA88E893FB89Yazorman@127.0.0.1>, Erland Sommarskog
<esquel@sommarskog.se> wrote:
>I have an issue that is so weird that I've gave up googling for it,
>before I even started. My excuse for using this newsgroup is that I have
>an ASUS Motherbord, M2NPV-VN, and I have gotten some good answers here in
>the past. But I don't really hold the motherboard as the culprit.
>
>The issue is that occasionally when I am to plug in a USB device using the
>front connection of my computer case and fiddle around to find my way,
>the computer powers off instantly. This has happened three times now over
>a period of couple of months. Last night when it happened, I had to pull
>out the power cable for some seconds to be able to turn on the computer
>again.
>
>The case is Antec Sonata II, but the power supply is from Corsair, as I
>had to replace two bad power supples from Antec. The operating system is
>Vista Ultimate x64 SP2, although I find difficult to believe that that
>matters.
>
The Antec Sonata case had a miswired USB front port on some cases. You had to
send off to Antec for a replacement
GMAN (winniethepooh@100acrewoods.com) writes:
> The Antec Sonata case had a miswired USB front port on some cases. You
> had to send off to Antec for a replacement
Seem that getting a new case is a better bet in that case. And I don't
think it will be Antec this time.
> GMAN (winniethepooh@100acrewoods.com) writes:
>> The Antec Sonata case had a miswired USB front port on some cases. You
>> had to send off to Antec for a replacement
>
> Seem that getting a new case is a better bet in that case. And I don't
> think it will be Antec this time.
That defect was years ago in the early version of the Sonata, around
2003. I have one of those still, but you said you have a Sonata II.
It's unlikely they would still have the same problem.
Anssi Saari (as@sci.fi) writes:
> Erland Sommarskog <esquel@sommarskog.se> writes:
>> GMAN (winniethepooh@100acrewoods.com) writes:
>>> The Antec Sonata case had a miswired USB front port on some cases. You
>>> had to send off to Antec for a replacement
>>
>> Seem that getting a new case is a better bet in that case. And I don't
>> think it will be Antec this time.
>
> That defect was years ago in the early version of the Sonata, around
> 2003. I have one of those still, but you said you have a Sonata II.
> It's unlikely they would still have the same problem.
Thanks. I got my case in 2006.
The problem started to appear this year. It is of course not improbable
that I've caused some miswiring myself, when I've opened the case and played
around with things.
In article <Xns9CA8F00AE95B8Yazorman@127.0.0.1>, Erland Sommarskog <esquel@sommarskog.se> wrote:
>GMAN (winniethepooh@100acrewoods.com) writes:
>> The Antec Sonata case had a miswired USB front port on some cases. You
>> had to send off to Antec for a replacement
>
>Seem that getting a new case is a better bet in that case. And I don't
>think it will be Antec this time.
>
>
they will send out the little port to you. you do not need to send the whole
case to them.
Instant power-off 
Linear Mode
