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#1
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plug in USB drive = reboot
I transferred a Gigglebite H61 mainboard to an old Antec Lanboy case.
All was fine until I plugged a thumb drive into front panel - PC rebooted! I guess the 5V line was shorted out. Now the the front panel cable in the Lanboy is marked, and the wiring agrees with the mainboard F_USB1 pins. I tried the thumb drive in another PC and it works there. I got a USB2 rear slot bracket and plugged that into the mainboard, USB devices work on that. I shone a light on the front panel sockets and no bent fingers in there. |
#3
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plug in USB drive = reboot
wrote:
I transferred a Gigglebite H61 mainboard to an old Antec Lanboy case. All was fine until I plugged a thumb drive into front panel - PC rebooted! I guess the 5V line was shorted out. Now the the front panel cable in the Lanboy is marked, and the wiring agrees with the mainboard F_USB1 pins. I tried the thumb drive in another PC and it works there. I got a USB2 rear slot bracket and plugged that into the mainboard, USB devices work on that. I shone a light on the front panel sockets and no bent fingers in there. To date, I've encountered wiring errors on two different models of Antec cases (these are from years ago). My recommendation on an Antec, is to either buzz out the front panel wiring before you use it, or just rip out the entire harness so you won't be tempted to use it. When I checked these wiring errors, *none* of the wiring errors involved VCC and GND pins. It always seemed to involve data pins. (I think I found an error on the Firewire wiring too.) And I don't think these errors are random either. They're not "people errors". They're engineering errors, so every cable assembly is the same off the production line. Some motherboards will have the header pinout in the user manual. Using that, and using a needle point probe set on your multimeter, verify the pins on the front of the case, go to the correct places on the 2x5 of the USB2. ******* Another possibility is inrush current. Say the motherboard has a 100uF cap near the header. The device has up to a 10uF cap inside for power filtering. The 100uF provides charging current for the 10uF inrush and helps hold up the line. (Caps cost money, and it's unlikely a USB key has a 10uF inside. The caps on a USB stick are more likely to be puny and 1uF.) Figure 5 on page 9 here, shows what happens when a USB peripheral is plugged in and it's bypass capacitor draws charging current. The graph they should have showed, is what happens to the +5VSB line voltage level in response. https://web.archive.org/web/20060626...therboards.pdf The manufacturer cannot place larger and larger caps on the +5VSB motherboard distribution. A reasonable limit might be 5000uF total per rail, to maintain loop stability on the ATX switching supply. So while the dual headers might have 100uF or 200uF on them, you can't go around beefing this up by buying caps at the store and soldering a 4700uF cap to the header on your own. There is a limit to total capacitance. The secret to stopping this, is for the peripherals to not be using large caps. To be compliant, they have a capacitance limit to, and if they stick with that limit, these dips in voltage won't happen. It's also possible to have "induced" reset issues, but that's unlikely to be the case. We had a product at work, where the reset signal was run for two or three feet inside the case, and ran to a reset button. If a little static discharge went into the chassis, the RESET wire worked line an antenna, and "received" the signal into the wire. This causes the PC to reset. The reset button and the USB header cables aren't likely to be in close proximity, but if your problem is reproducible, try unplugging the reset button twisted pair from the motherboard, so that the reset cable to the front panel RESET button, cannot provide an antenna action, then retest front panel USB insertion. It's when the problem is intermittent, that it'll take forever to figure out. Paul |
#4
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plug in USB drive = reboot
On 23/12/2017 11:34 AM, wrote:
I transferred a Gigglebite H61 mainboard to an old Antec Lanboy case. All was fine until I plugged a thumb drive into front panel - PC rebooted! I guess the 5V line was shorted out. Now the the front panel cable in the Lanboy is marked, and the wiring agrees with the mainboard F_USB1 pins. I tried the thumb drive in another PC and it works there. I got a USB2 rear slot bracket and plugged that into the mainboard, USB devices work on that. I shone a light on the front panel sockets and no bent fingers in there. You need a multimeter to check for shorting. Remember to power off the computer and unplug the AC plug first. -- @~@ Remain silent! Drink, Blink, Stretch! Live long and prosper!! / v \ Simplicity is Beauty! /( _ )\ May the Force and farces be with you! ^ ^ (x86_64 Ubuntu 9.10) Linux 2.6.39.3 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA): http://www.swd.gov.hk/tc/index/site_...sub_addressesa |
#5
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plug in USB drive = reboot
On Saturday, December 23, 2017 at 4:24:24 PM UTC+8, Paul wrote:
different models of Antec cases (these are from years ago). My recommendation on an Antec, is to either buzz out the front panel wiring before you use it, or just rip out the entire harness so you won't be tempted to use it. I just wrapped some gaffer tape over the end of the front panel plug so I don't try it again one day. BTW I have another Lanboy case that works fine... |
#6
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plug in USB drive = reboot
On 23/12/2017 8:35 PM, Mr. Man-wai Chang wrote:
You need a multimeter to check for shorting. Remember to power off the computer and unplug the AC plug first. And if it's a notebook or laptop, detach the battery! -- @~@ Remain silent! Drink, Blink, Stretch! Live long and prosper!! / v \ Simplicity is Beauty! /( _ )\ May the Force and farces be with you! ^ ^ (x86_64 Ubuntu 9.10) Linux 2.6.39.3 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA): http://www.swd.gov.hk/tc/index/site_...sub_addressesa |
#7
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plug in USB drive = reboot
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