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P4P800-E Deluxe USB
I have this board running Win XP SP1 with 1gig of DDR memory. Every now and
then at no particular time frame my USB ports stop working. Any device that requires power stops. My scanner and printer continue to work. The only way to get the powered USB devices to work is to reboot the machine. Any ideas on how to fix this? TIA Andy |
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Thanks but I don't think thats my problem.
The USB mouse only draws 20ma. and a self powerd hub i have hooked up to a different USB port stops working. In fact all the USB ports stop working with any device that requires power. Andy I have this board running Win XP SP1 with 1gig of DDR memory. Every now and then at no particular time frame my USB ports stop working. Any device that requires power stops. My scanner and printer continue to work. The only way to get the powered USB devices to work is to reboot the machine. Any ideas on how to fix this? TIA Andy The USB ports are protected by polyfuses. These are fuses that open circuit when they get hot, and close again when they cool off. The fuses are there to protect against a short circuit on the USB +5V from damaging the motherboard. Generally, a USB port is allowed 500mA of current, and if it draws more than that, the port will be powered off. Check that you aren't using a non-compliant device. An example is the Alcatel "frog" ADSL modem, which draws slightly more than 500mA. If you must use the device in question, a possible work around is to use a powered USB 2.0 hub to run the device. Sometimes they are a little more forgiving than a motherboard. You can see samples of the polyfuses, just above the USB56 and USB78 headers. It is possible the power is also switched by MOSFETs somewhere as well (not sure). Another reason for USB ports to "wink out", is if there is some kind of power management issue. I think there is an option somewhere in the Device Manager, to allow Windows to power down stuff that is not active, and that is another possible source of your problem. Since your scanner and printer are working, it isn't likely to be power management. For your amusement, I found a link to a doc on usbman.org . Usbman has some info on USB and sometimes has fixes for USB problems. This doc is from Intel and describes some of the stuff I mentioned above. http://www.usb.org/developers/whitep...therboards.pdf HTH, Paul |
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