Announcement

Collapse
No announcement yet.

Epia USB Stays On

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Epia USB Stays On

    i have seen other searches but still didnt see any resolutions
    anyone else figure this out???

    The freakin USB stays powered even if the computer is turned off.

    Right now i have the Epia plugged into a regular power supply, and when i turn it off the mouse and gps still have power.

    What gives??? Anyone know???
    1999 Camaro z28
    -- Computer installed :) Phase 1
    -- z28 302hp dynoed :( WAHH!!!!

  • #2
    hey never mind apparnetly thats how epia's work .... so u can acivate it witht a mouse movement.

    Anyway .... does anyone know if this will cause any prolonged problems? to devices we hook up to the USB?? And does anyone know is this all usb ports or just the direect oens in the back??
    1999 Camaro z28
    -- Computer installed :) Phase 1
    -- z28 302hp dynoed :( WAHH!!!!

    Comment


    • #3
      If that actually gets in your way, you can get an external powered hub. Cut open the USB cable leading to the HUB and sever the voltage line. Then wire the hub to your power supply, so that you can control when it's on/off, aka when the devices you connect to it get power or not.

      Comment


      • #4
        it doeesnt bother me per se .... just was wondering if this is gonna cause any long term problems? Since the gps will always be on, and all that other stuff?
        1999 Camaro z28
        -- Computer installed :) Phase 1
        -- z28 302hp dynoed :( WAHH!!!!

        Comment


        • #5
          in the bios you should be able to turn it off
          Pete Kastner www.KastNERD.com

          Comment


          • #6
            My serial port stays on too.

            It hasn't drained my battery yet

            I use my car every day though so i havn't let it sit for a weekend or longer.

            EDIT: This weekend it drainded my battery. I needed a jump. I was running the computer for quite a long time though with the engine off so i don't think it was beasue of normal USB/serial drain
            -Jesus- King of Kings Lord of Lords

            Comment


            • #7
              I use the ITPS and after 45 secs it cuts power to the mobo all together in case windows craps out during shutdown (as it often does) ... so it's not an issue for me.

              I'd suggest doing something similar. have something cut power to the powersupply when the car's off (after a minute or so) so it won't drain any power
              My JeepPC Install

              "there are no stupid questions, just stupid people."

              "it's been agreed the whole world stinks so no one's taking showers anymore"

              Comment


              • #8
                i am going to be using an OPUS .... so if i recall corectly that has a built in shutdown controller that should take care of the job.

                And no there is nothing to disable it in the bios ... at least from what i can tell .... if you have an epia and no where it is .. i'd love to find out.
                1999 Camaro z28
                -- Computer installed :) Phase 1
                -- z28 302hp dynoed :( WAHH!!!!

                Comment


                • #9
                  OK Here are a couple answers from experience on this matter -

                  1) There is no way to fix this problem in the BIOS or the serial port. I have confirmed this with VIA. The hardware seems to be incapable of this.

                  2) The opus 90W CAN cut all power to the motherboard when shut down, but the 150W CAN'T. IE if you use a 90W opus, you don't have to worry about this if you set it to cut all power.

                  3) The hub-hacking method caused (for me anyway) some very odd power problems. Sometimes when I'd plug in USB devices, the computer would reboot. It would reboot at random every hour or two on longer trips.

                  The solution for me was to cut the 5V lines inside the cable that attaches to the USB header on the motherboard and add some 5V reed relays that are triggered by the switched 5V line on a drive power cable. That way, power gets cut to two USB ports when the power is off, but when the computer is on, power is still supplied to the ports in the normal fashon. You can't do anything about the onboard ports, but if you need a few more ports you can add a USB hub normally to one of these two new battery-friendly usb ports...

                  Reed relays are a good choice for this because they are cheap, they only have a NO connection, and their maximum current rating of 500mA is the maximum spec for USB.

                  Here's a photo of the modified cable:
                  MY CAR IS FOR SALE!
                  See My Project Page for Details - 2003 BMW E46 ///M3
                  Custom Dash Monitor Housing - OEM Fitment
                  Custom Overhead DVD-ROM Housing in Headliner
                  BMW I-Bus Integration
                  My homepage with many other fun projects!

                  Comment


                  • #10
                    What in the heck is going on in that cable of yours.

                    And to correct you about the opus 90w: It does still apply power to USB and Serial Devices when it is switched off.

                    I could be wrong here and if so please tell me how to make it turn off all power (was that one of the jumpers?). I believe that i have it set to kill all power.
                    -Jesus- King of Kings Lord of Lords

                    Comment


                    • #11
                      Originally posted by antimatter
                      And to correct you about the opus 90w: It does still apply power to USB and Serial Devices when it is switched off.

                      I could be wrong here and if so please tell me how to make it turn off all power (was that one of the jumpers?). I believe that i have it set to kill all power.
                      The 90 watt OPUS has a jumper so the user can select if they want standby power to be enabled (ATX spec) or not (shuts off power to everything).

                      Comment


                      • #12
                        Kris told me that the 90W could be set to cut all power. Maybe it's a jumper or something? I don't have one, so I was just going on the authority of the dude that designed it I guess you should email him for the answer..

                        On the cable -- the 5V line from the USB header is cut and wired into the switched terminals of the relay. There is an external 5V feed coming in to power the relay coils. It's attached to a drive power connector. Thus, when the psu turns on, it switches on the relays and connects up the 5V lines from the motherboard header to the USB ports. Here's a simple schematic:

                        MY CAR IS FOR SALE!
                        See My Project Page for Details - 2003 BMW E46 ///M3
                        Custom Dash Monitor Housing - OEM Fitment
                        Custom Overhead DVD-ROM Housing in Headliner
                        BMW I-Bus Integration
                        My homepage with many other fun projects!

                        Comment


                        • #13
                          Seems like it might be easier to just cut the standby wires in the standard ATX power cable that runs from power supply to the mobo. I don't think that should hurt anything, and then any ATX power supply should work fine.

                          Check out the ATX pinout. You want to cut pin 9. Please make sure you try this on an extension cable first though, I wouldn't want to encourage anyone to cut the built in wiring for their ATX PS.

                          Twostep

                          Comment


                          • #14
                            I talked to Kris from Opus about cutting the 5VSB, who suggested not doing it. One of the 3.3V wires is also supplied during standby, but I forget which it is. It might be a good idea to put these wires on a relay instead, though, but since the USB is the only thing I was really worried about, it's the only thing I controlled the power to...
                            MY CAR IS FOR SALE!
                            See My Project Page for Details - 2003 BMW E46 ///M3
                            Custom Dash Monitor Housing - OEM Fitment
                            Custom Overhead DVD-ROM Housing in Headliner
                            BMW I-Bus Integration
                            My homepage with many other fun projects!

                            Comment


                            • #15
                              I stand corrected.

                              It was the factory installed jumper (leave standby power on). When i leave that jumper on my machine starts up properly but doest shut down. Any ideas?
                              -Jesus- King of Kings Lord of Lords

                              Comment

                              Working...
                              X