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  • VGA Cable causing engine noise

    So I finally troubleshot my noise (cross between white noise and alternator whine) to be the VGA cable.

    I have a 25' VGA cable (although I wish it was 15' now because I've got tons of extra wire and it's a little fuzzy) running from my dash to my trunk.

    What's strange, though, is that I have the VGA cable running with the keyboard (PS2) and USB cable. Neither of them cause the noise - it's only when the VGA cable is plugged in, so it is getting interference somehow..

    I'm wondering if it's because my LCD is grounded to a different spot (12v cigarette lighter for now) or if it is just getting some disturbance from any of the 10+ wires it goes near which run inside my dash, down into my kick panel, and down through the door sill to power other components of my car, such as taillights, trunk release, brake lights, fuel pump, and other various rearward car components...

    Which do you guys think (as a point to begin troubleshooting further)??

    I guess I could unplug my LCD power source and see if that makes a difference.. maybe it IS because of a ground loop? (does that make a ground loop?)



  • #2
    well vga cables are shielded but not a lot. cause they dont really need to be. u can wrap the entire cor din a few layers of electrical tape

    or have the vga running else where

    since u have SO much extra i'd recomend running it over the door instead of under.. (if u have the room) this should help.. then around your wires/HU i'd wrap it in some electrical tape

    also kb/mouse doesnt carry much of a current so it wouldnt do squat

    hope i helped?

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    • #3
      Dont think its your vga cable. I thought it was mine too but ordered a triple shielded and didnt do a thing. Its a ground thats causing the problem. Funny thing is, this only started when I put my opus in. Didnt do it when I had my old 250w dc-dc atx. I have to track this down somewhere.

      Comment


      • #4
        Yeah I'm not sure if it's my VGA or the fact that my VGA is grounding my PC chassis to the LCD (VGA cables have ground wires, right?) which is grounded to a separate spot than my PC is grounded too -- causing a ground loop. (Or am I on crack?)

        One option would probably be to put in a ground-loop isolator on my RCA to my AMP from the PC. I think that would help... I hope it would.. It fuggin better!

        I don't know what paradox means by running the VGA "over the door". How is this possible? You mean up in the roof? I don't think my car has a molding up there all the way across, but I'll double-check.. I suppose I could pop the headliner off and run it behind that, if there's room, but now we're talking some serious work and something I've never messed with before (headliner).

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        • #5
          Anyone know how to ground a VGA cable?

          Also, should I gound my PC chassis or would it not make a difference? I'll try it, I just don't want to blow something up - ya know? I was thinking since my motherboard and vga controller and etc are not even grounded to the chassis case, I don't see how it would make a difference at all.. or is maybe the motherboard grounded by the mounting screws??

          *shrug*

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          • #6
            yeah.. im getting horrible flicker on my LCD too . But i cant even begin to know where the noise might be coming from

            ....I do have alot of extra VGA cable too (maybe i should measured my car first)

            ....does anyone have any clue? or solution
            2002 Suzuki Aerio Sedan ...NOT the stupid wagon

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            • #7
              Try this thread... I'm not sure if it's what you're talking about or not.

              http://www.mp3car.com/vbulletin/showthread.php?t=37570

              Comment


              • #8
                You said you're running you VGA with the USB. If the USB is unplugged, is the noise still there?
                Renault Megane...the OEM look

                The Lost in Europe Ford Escort

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                • #9
                  Originally posted by egeekial
                  Try this thread... I'm not sure if it's what you're talking about or not.

                  http://www.mp3car.com/vbulletin/showthread.php?t=37570
                  YES!

                  I think that is exactly what I need to solve my problem!! Ill pick one up tommorrow
                  2002 Suzuki Aerio Sedan ...NOT the stupid wagon

                  Comment


                  • #10
                    If you suspect that RCA cable is the cause of noise, make your own RCA cable using the cheap CAT 5 cable. Each wire of the twisted pair for each + and -.
                    2004 Matrix XR A7N8X-VM/400 AMD XP-M 2500+, DS-ATX
                    89 Supra Turbo P3 [email protected]/Abit BE6 II, Alpine M-BUS Car2PC.
                    Y2K Accord Dell GX150
                    RoadRunner is the best FE PERIOD
                    EmoRebellion is a SCAMMER

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                    • #11
                      if you run live power wire next to a rca cable it will cause noise as in the instalation of an amp that is why you run the rca on the opposite side of the car as the power wire just thought id share that

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                      • #12
                        another tip. If you absolutely have to cross the two (power and a signal wire) try and have them cross at a 90 degree angle. This will minimize the surface area avaliable for interference. Otherwise they should always be run AS FAR AS POSSIBLE from each other. Also, if you get cheap RCAs you will run into a problem with noise as they aren't shielded as well as decent RCAs. Believe me on that one. I can't tell you how many people I have had come to me with cheap RCAs with some of the same problems. They spend the money on a good set of RCAs and bam, the noise is gong and the system is much stronger (louder, cleaner, better sounding all around).
                        Jan Bennett
                        FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

                        Please post on the forums! Chances are, someone else has or will have the same questions as you!

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                        • #13
                          Originally posted by Red GTi VR6
                          another tip. If you absolutely have to cross the two (power and a signal wire) try and have them cross at a 90 degree angle. This will minimize the surface area avaliable for interference. Otherwise they should always be run AS FAR AS POSSIBLE from each other. Also, if you get cheap RCAs you will run into a problem with noise as they aren't shielded as well as decent RCAs. Believe me on that one. I can't tell you how many people I have had come to me with cheap RCAs with some of the same problems. They spend the money on a good set of RCAs and bam, the noise is gong and the system is much stronger (louder, cleaner, better sounding all around).

                          So true. Discovered that on my own unfortuanatlly...
                          Renault Megane...the OEM look

                          The Lost in Europe Ford Escort

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                          • #14
                            lol - which part? the RCAs or the 90 degree cross?

                            heh
                            Jan Bennett
                            FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

                            Please post on the forums! Chances are, someone else has or will have the same questions as you!

                            Comment


                            • #15
                              Originally posted by Red GTi VR6
                              lol - which part? the RCAs or the 90 degree cross?

                              heh
                              The RCA part.
                              Renault Megane...the OEM look

                              The Lost in Europe Ford Escort

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