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  • VGA cable shorting PC?

    I've read several posts about something similar to this but not quite at the same time and none of those suggestions seem to help.

    My PC works beautifully on a desktop ATX PSU. In the truck the computer seems to boot properly when the monitor is not attached but as soon as I attach it the CPU fan spins then quits over and over again.

    My guess is it's either the power or ground going to/coming from the monitor but I checked all of my connections and everything seems fine but, I'm not sure exactly how to test everything.

    I have an OPSU 360W PSU so I have lots of power.
    PROGRESS:
    Hardware: 100%
    Software: 99% - Always upgrading and improving.
    Installation: 100%

    WORKLOG:
    2005 F-150

  • #2
    UPDATE:
    To eliminate some possibilities I connected just the power to the monitor and turned on my truck. Everything works as normal, so I tried connected the VGA cable to the monitor while the PC was running and the PC instantly shut off. I know there's a short somewhere, I just can't see where or how to fix it.
    PROGRESS:
    Hardware: 100%
    Software: 99% - Always upgrading and improving.
    Installation: 100%

    WORKLOG:
    2005 F-150

    Comment


    • #3
      it sounds like you have eliminated everything but the monitor-- would it be possible to try it on a different computer?
      My OLD 2001 Mitsubishi Eclipse GT:
      "The Project That Never Ended, until it did"


      next project? subaru brz
      carpc undecided

      Comment


      • #4
        In an awkward round-about way that involved a 12V AC-DC brick and a spoon (don't ask), I managed to test in with my laptop and it worked perfectly fine.

        What in my truck could be causing the short?
        PROGRESS:
        Hardware: 100%
        Software: 99% - Always upgrading and improving.
        Installation: 100%

        WORKLOG:
        2005 F-150

        Comment


        • #5
          a vga extension cable?
          My OLD 2001 Mitsubishi Eclipse GT:
          "The Project That Never Ended, until it did"


          next project? subaru brz
          carpc undecided

          Comment


          • #6
            None being used. I'm using the exact same cable in the truck as I tried in the house.
            PROGRESS:
            Hardware: 100%
            Software: 99% - Always upgrading and improving.
            Installation: 100%

            WORKLOG:
            2005 F-150

            Comment


            • #7
              ok, so now i have to ask: what was the spoon for??
              My OLD 2001 Mitsubishi Eclipse GT:
              "The Project That Never Ended, until it did"


              next project? subaru brz
              carpc undecided

              Comment


              • #8
                Haha. I'll accept your question and use it as a bump.

                My touchscreen is molded (kind of) into my bezel from the truck and the way I put it together plus the fact that I didn't want to crimp the AC-DC power supply to my monitor power wires, the only way I could put it together was face down. If I moved it the wires probably would have come loose. Needless to say I couldn't find a small mirror but have very shiny spoons. Everything was upside down and circus mirror like but the monitor did work from my laptop.
                PROGRESS:
                Hardware: 100%
                Software: 99% - Always upgrading and improving.
                Installation: 100%

                WORKLOG:
                2005 F-150

                Comment


                • #9
                  UPDATE:
                  I brought the entire PC into the house to check and it works fine on my regular LCD monitor so I connected the touchscreen to the truckputer inside and it works fine. What gives?
                  PROGRESS:
                  Hardware: 100%
                  Software: 99% - Always upgrading and improving.
                  Installation: 100%

                  WORKLOG:
                  2005 F-150

                  Comment


                  • #10
                    It sounds like drawing too much power and reboot cycling, when i am doing updates in my driveway with engine not running i need to connect charger on 10amps to keep from reboot cycle. Can you power monitor via lighter socket and connect vga to comp? SNO

                    Comment


                    • #11
                      It does it even when the truck is running.

                      Based on my specs the OPUS 360W should be able to put out more than enough power, especially since the monitor is 9W and I unplugged 10W worth of USB devices alone when I was troubleshooting but I'll give it a shot right now and see what happens.
                      PROGRESS:
                      Hardware: 100%
                      Software: 99% - Always upgrading and improving.
                      Installation: 100%

                      WORKLOG:
                      2005 F-150

                      Comment


                      • #12
                        Well, I tested it with the cigarette lighter and it works. I guess that's good and bad news. Why wouldn't my PSU be good enough to start up the monitor?
                        PROGRESS:
                        Hardware: 100%
                        Software: 99% - Always upgrading and improving.
                        Installation: 100%

                        WORKLOG:
                        2005 F-150

                        Comment


                        • #13
                          maybe its not playing nice with your mainboards power switch wires to power supply or however you have it wired, i just ran a separate switch to my mainboard. mine is a manual system. i keep forgetting to mention i have 07 150, and where in bc you at? SNO

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                          • #14
                            Kamloops.

                            This is getting absurd. I noticed I get the 3 flashes on my OPUS when the monitor is connected which means that I'm trying to draw more power than the OPUS can output. I don't understand this at all because on the 12V rail I'm only drawing about 5.5 amps and the 360W is supposed to max 15A
                            PROGRESS:
                            Hardware: 100%
                            Software: 99% - Always upgrading and improving.
                            Installation: 100%

                            WORKLOG:
                            2005 F-150

                            Comment


                            • #15
                              The cigarette lighter power adapter that came with my touchscreen has a "power filter" on it. Is that the equivalent as regulated power? If it is I'm just going to tap into the cigarette lighter, if not I really want to figure out what the problem with this PSU is.
                              PROGRESS:
                              Hardware: 100%
                              Software: 99% - Always upgrading and improving.
                              Installation: 100%

                              WORKLOG:
                              2005 F-150

                              Comment

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