Question about ASUS P5S800-VM Motherboard

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No USB operation

The board was working fine for 2 years but slowly I was noticing my 4 USB drives were taking more time to start moving files from one USB drive to another or to my IDE drives. Once they started file transfers, it works ok but you have to wait a while. Sometimes I would get a message that Explorer needs to shut down and I had to open up all my drives again. This went on for a while. Now, I can't use any of my USB drives. They are not recognizable. Neither is my thumb drive. All my drives work fine on my other computer. Everything else on the board works ok. There are no yellow exclamation marks in Devive Manager. All the drivers are there. There's not much in Manage to re-start the USB operation in case it got changed by some cause. The settings in Manage under USB are the same settings as in my other computer. I don't see anything else to do but to buy a new board.

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  • kb2jxm7 Nov 17, 2008

    I measured the voltage on my USB ports. 2 pins have 5.13V. The others are either ground or low's until the signal appears. I know about the bad capacitors as I have gone through that for years. Mine are not domed or open at the top. With the scope and DMM measuring 5.13V, this is a sign that the regulator and capacitors are ok. Unless you have other ideas, So far I'm still going to say that the board is bad.

  • kb2jxm7 Nov 18, 2008

    That's Steve for your help. We are on the same page. I've been an electronic tech for 35 yrs and have a few scopes here. At work, I troubleshoot, calibrating, and repair tranponders/Interrogators for military aircraft, 727's, 737', 747's, etc.

    The strange thing that is going on here is that I'm still able to D/L pictures from my cam on this comp and still it doesn't recoginze my USB drives. Only the cam. Strange.

  • kb2jxm7 Dec 08, 2008

    Hello again. Steve is it? I've been away myself with other important matters but I'm back now and I've tried one more thing before I put the board to the grave. I took out the BIOS battery and put it back in the next day. I booted the comp back up and it asked for RAID Controller drivers. I put the XP CD in and they loaded ok. The comp booted up ok as it usually does. Then, just for ha-ha's, I tried the USB's again and they worked! Wow! Then I went back into the BIOS and checked to see if there were any changes in the USB settings (there's not much) and they were the same. Still to this day (12/7/08), all the USB's are working! It's really strange since I checked the BIOS before. Anyway, thanks much for your help. Maybe I can help you fix something if you're in my area. I'll let you use my scopes! LOL! :)


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If this were a driver issue you would have the exclamation marks you already checked for in Device Manager. USB connectors supply a voltage out to the usb devices as well as signals in and out so the regulator components may have failed for that voltage. You can buy a PCI usb card if you have a spare PCI slot if you don't want to change the motherboard yet but don't just buy a usb front panel card as it uses the same connector as the existing usb connectors use. 2 years later there are more features that you might find useful and if there are budget considerations you could find another motherboard that accepts the same cpu, RAM and drives. There were issues of substandard capacitors being sold to motherboard manufacturers a few years ago that would cause this gradual deterioration as well as accumulated dust that acts like a thermal blanket on components. ~Steve Medley

Posted on Nov 15, 2008

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  • Stephen Medley
    Stephen Medley Nov 17, 2008

    Thank you for your patience. I had a job to do in the field here. The only way to evaluate the signals under load is with an oscilloscope. I applaud your hands-on initiative to check your motherboard voltages and that is actually a step further towards what would next be signal analysis that even I have not performed at board level since I worked on a submarine below the Arctic ice cap -I would have loved to go mobo shopping at that time were it possible. I concur that there are I/O problems at the motherboard. If you ever need assistance in even verifying a DOA hardware device you are welcome here at FixYa! respectfully, Steve Medley

  • Stephen Medley
    Stephen Medley Dec 08, 2008

    Great news and thanks for sharing your success! One interesting thing I wonder is whether you have a raid hard drive set up, lol. Back in the days of Windows 98 there were modem problems that we could sometimes resolve by changing PCI Steering settings which were normally not required for modems until the Win modem which had less onboard hardware but utilized more of the motherboard/cpu resources. In other words opening up more IRQs and I/O paths and DMA options offer optional routing not normally required if all component-level semi-conductors and connecting paths are 100%. As for scopes -I miss my scopes as I always had the military resources to use and never had to buy my own:) regards, Steve Medley

  • Stephen Medley
    Stephen Medley Dec 08, 2008

    One thing that is not really a problem but many of my fellow experts here find unfair is when a free solution is provided that a rating actually can lower our rating status when the problem turns out to be not a complete fix but a pointer to a better understanding of what the problem could be without the luxury of being there. That is why many of us use clarification rather than solution status answers and even eventually decide to never use the solution status on free service for bad news or just stop offering information to avoid a lower rating that might further troubleshooting. I have seen my free advice lower my ratings because it did not fix something though I did take the time to try and instill hope for something that I truly believed was worth pursuing. Please keep that in mind when rating since a higher rating -almost like an "E" for effort costs you nothing. respectfully, Steve Medley


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