USB port cant detect
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Posted by jonray_jay on September 2, 2008, 2:23 am
Please log in for more thread options Need help....... i have acer veriton 7600g,, all of its usb port cant detect.. the driver is already installed and device manager post it "device is working properly".. i also tried other usb disk , mouse keyboard but then still cant detect.. -- Posted at author's request, using moderated http://www.PCForumz.com interface Thread archive: http://www.PCForumz.com/USB-port-detect-ftopict87550.html | |||||||||||||
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Posted by Paul on September 2, 2008, 3:11 am
Please log in for more thread options jonray_jay wrote: That is a known issue. There were a rash of failures of ICH5 Southbridges in the last couple of years. Your computer uses ICH5 (as does the computer I'm typing this on). The failure, at least to me, is indicative of "latchup" failure. The second link gives an explanation (but a diagram may have made the description easier to understand). http://www.acersupport.com/desktop/html/v7600g_specs.html http://en.wikipedia.org/wiki/Latchup Failure can be at two levels of damage. In this picture, the motherboard is basically ruined when the USB port fails. There is a burn mark on the chip. If this happens, the computer will no longer boot. It would need a new motherboard. There is no way to predict how a given chip will fail - at least some go in a spectacular fashion like this one did. http://onfinite.com/libraries/179057/2ea.jpg Many people suffer a less violent failure. What happens is, the Device Manager continues to show the normal USB device entries, and all are reported as functional. When the chip burns inside (hidden from the user), power to the USB I/O pads is lost, and then the USB port can no longer connect to external devices. A workaround, for desktop systems, is to install a PCI USB2 card, to provide some replacement USB ports. This will not help you, if the computer uses a USB keyboard. At least for the purposes of adjusting the BIOS values, a working keyboard connected to the Southbridge would normally be needed. If you currently have a USB keyboard, you can always plug in a PS/2 keyboard, for those occasions where the USB one is not working. I normally use a PS/2 keyboard, so this would not prevent me from having full keyboard functionality in my BIOS screens. Only one company (Gigabyte) has publicly acknowledged there is a problem. I haven't seen anything on the Intel site. On at least one Asus motherboard, they actually replaced the Southbridge chip under warranty - that is not exactly an easy repair to do, as there is a risk the motherboard will be damaged while repairing it. There are a large number of contacts on the bottom of the chip. The motherboards use a pretty poor quality of printed circuit board, which makes the repair more dangerous to do. http://tw2005.giga-byte.com/Motherboard/Support/FAQ/FAQ_456.htm If the warranty is expired on the computer, it is hard to predict whether there will be a "hidden warranty" coverage for the failure. I expect the computer companies get some kind of compensation from Intel, when servicing these failures - if they didn't, there would have been more bad press about this problem. http://tw2005.giga-byte.com/Motherboard/Support/FAQ/FAQ_456.htm Since you did not mention having a problem booting the computer, then my suggestion would be to install a PCI USB2 card, to take the place of the non-functional USB ports. As a rule, all the USB ports on the Southbridge fail at the same time. I haven't heard of any partial failures. They all seem to go at once. A new PCI USB2 card will cost about $10. This will place four connectors on the back of your computer. You need an empty PCI slot, to be able to use this. "SYBA PCI USB 2.0 4+1 port controller card Model SD-V2-5U Based on NEC uPD720101" http://www.newegg.com/Product/Product.aspx?Item=N82E16815124008 Good luck, Paul | |||||||||||||
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Posted by GT on September 2, 2008, 4:30 am
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> Need help.......
> > i have acer veriton 7600g,, all of its usb port cant detect.. the > driver is already installed and device manager post it "device is > working properly".. > > i also tried other usb disk , mouse keyboard but then still cant > detect.. Quick check - Have you entered the BIOS to check that USB is turned on? | |||||||||||||
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Posted by philo on September 2, 2008, 8:03 am
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> > Need help.......
> > > > i have acer veriton 7600g,, all of its usb port cant detect.. the > > driver is already installed and device manager post it "device is > > working properly".. > > > > i also tried other usb disk , mouse keyboard but then still cant > > detect.. >
> Quick check - Have you entered the BIOS to check that USB is turned on? > > Yes...check the bios and enable USB !!!! | |||||||||||||
>
> i have acer veriton 7600g,, all of its usb port cant detect.. the
> driver is already installed and device manager post it "device is
> working properly"..
>
> i also tried other usb disk , mouse keyboard but then still cant
> detect..
>