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  • What The Fu**.....

    Hey check this, a while ago i posted a message saying i had problems with interference on my LCD screen well after trying everything 50 times that everyone suggested the problem still persists but yesterday i had a weird situation, i booted the PC and yet again interference on screen ,removed the cable (TV OUT) until just the core was in and the screen cleared up (not perfect) so i put the cable back in and interference again BUT as i was putting things back as i was well and truly P'd off i accidently pulled the jack plug out of the base unit which sends the sound to the RF Modulator and the signal on the screen DISSAPEARED ALTOGETHER!!!!! just went blue as if it was getting no signal and yet the tv out cable was still in, put the audio cable back in and up come the picture still with the interference!, now please anyone any idea as i now had enough and basically thinking of scrapping the PC altogether, how can an audio cable effect tv out!?!?!?!??!?!?!

  • #2
    Originally posted by CelicaNUT
    Hey check this, a while ago i posted a message saying i had problems with interference on my LCD screen well after trying everything 50 times that everyone suggested the problem still persists but yesterday i had a weird situation, i booted the PC and yet again interference on screen ,removed the cable (TV OUT) until just the core was in and the screen cleared up (not perfect) so i put the cable back in and interference again BUT as i was putting things back as i was well and truly P'd off i accidently pulled the jack plug out of the base unit which sends the sound to the RF Modulator and the signal on the screen DISSAPEARED ALTOGETHER!!!!! just went blue as if it was getting no signal and yet the tv out cable was still in, put the audio cable back in and up come the picture still with the interference!, now please anyone any idea as i now had enough and basically thinking of scrapping the PC altogether, how can an audio cable effect tv out!?!?!?!??!?!?!
    Ground loop?
    Laidback


    The ultimate CarPC - Wow!

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    • #3
      sorry buddy GROUND LOOP meaning what? i have grounded everything in turn even run a wire directly to the battery NEG and to no avail, tried inline resistor and cap and still no help, surely its the PC somehow?!? but im realy stumped now .

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      • #4
        Ground loop is when ground seeks ground thru other sources, which creates undesirable current flow. I would ground everything (all ground planes) to ground. Using no resistors. They use resistors to "pad" grounds, sometimes you get noise on ground and you use a resistor to 'somewhat' get it off of that potiential. Once you got everything grounded, start removing devices that are not needed for a display until you get a clean screen. Turn your car off, and run it off of an external 12v if nessary.

        RF is extremely acceptable to ground loops and since a car is not really at earth ground (its on rubber tires), Im suspecting that modulator.
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        • #5
          Originally posted by CelicaNUT
          sorry buddy GROUND LOOP meaning what? i have grounded everything in turn even run a wire directly to the battery NEG and to no avail, tried inline resistor and cap and still no help, surely its the PC somehow?!? but im realy stumped now .
          Yeah, I did put a question mark after it!

          It's difficult without knowing your setup but if I were in your position I'd try...

          Leave the sound unplugged and try to get the video working - the usual ways, re-install drivers, check bios etc.
          If it doen't work without the sound jack plugged in, which it should, then it's probably a faulty sys board. Did it ever work without the sound jack in?

          Edit: See, without knowing, I'm presuming it's on-board video?!?
          Laidback


          The ultimate CarPC - Wow!

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          • #6
            Originally posted by Laidback
            If it doen't work without the sound jack plugged in, which it should, then it's probably a faulty sys board.
            Could be... also check if the ground-signal of the video-cable you are using is not broken.
            Needstorage
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            • #7
              Thanks for the replies, i posted before basically i changed the head unit (Kenwood for Pioneer) so i can fit a CD Changer i had already, everything worked fine with the Kenwood head unit (perfect screen) but after changing the Head unit this problem appeared, i wired EVERYTHING back as it was except on the new pioneer loom but since i have had this problem so as you can imagine its annoying to say the least!. When you say ground everything do you mean a wire from the casing of say modulator/screen/headunit etc? by the way i disconnected the modulator / sound and power and the problem was still there i am running an inverter and i have noticed a buzzing from the PSU in teh base unit but i thinks it prob normal/ disconnecting the power line from the PC and having the inverter still on clears the screen (a little) sees to be picking noise up from everywhere. The screen and headunit both get power from the same wire ,inverter is powered from the cigar lighter and the amp in the boot also runs from the same wire as the head and screen. think thats it.

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              • #8
                Originally posted by CelicaNUT
                Thanks for the replies, i posted before basically i changed the head unit (Kenwood for Pioneer) so i can fit a CD Changer i had already, everything worked fine with the Kenwood head unit (perfect screen) but after changing the Head unit this problem appeared, i wired EVERYTHING back as it was except on the new pioneer loom but since i have had this problem so as you can imagine its annoying to say the least!. When you say ground everything do you mean a wire from the casing of say modulator/screen/headunit etc? by the way i disconnected the modulator / sound and power and the problem was still there i am running an inverter and i have noticed a buzzing from the PSU in teh base unit but i thinks it prob normal/ disconnecting the power line from the PC and having the inverter still on clears the screen (a little) sees to be picking noise up from everywhere. The screen and headunit both get power from the same wire ,inverter is powered from the cigar lighter and the amp in the boot also runs from the same wire as the head and screen. think thats it.
                Ok, so it's probably not a faulty sys board. You need to start isolating the components from each other while you fault find. e.g. Computer & screen on their own power & ground wires...
                Laidback


                The ultimate CarPC - Wow!

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                • #9
                  You Keep looking past the problem, it's the RF modulator. You disconnected it from the signal- so what? The antenna's still getting power. Hardwire the line without the modutor. Better sound, no interference.

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                  • #10
                    So what you saying the ariel cable is picking up interference and then this is appearing on the LCD? in confused, why would this affect the signal to the screen? also i have disconnected it from the power and also from the jack plug on the base unit (PC) would this not be enough to eliminate it as the problem? should i disconnect it completely the ariel loop aswell? im only asking as its a b'tard to get to as i have a complete install in the boot and it means ripping the boot apart to get to the ariel cable sending the signal to the headunit, what are the chances of this being the cause.

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                    • #11
                      If nothing else, you can isolate the ground loop with a small ceramic disc capacitor on the outside shield of the TV out. Just use a female and male jack, wire the center directly and put the cap across the 2 outside shield connections. Sorry, I don't know what farrads would be.

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                      • #12
                        VGA cords are very thin.. the shielding is.. so so. Almost anything will cause interferece. If you HAVE removed power from the RF unit; then the signal interference it causes SHOULD stop, but you might also want to try moving the antenna out of the car to make sure (large hunks of metal... but I dont see why THAT would effect it and not the car chassis)

                        Ariel loops, strange TV antennas have a way of creating strange ****ed up fields- but usually they need power. So I donno


                        Even if it doesn't stop the interfere, you should really hardwire it to your headunit man.

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                        • #13
                          The common denominator between the LCD panel and your audio cable is the ground. There is a problem with your grounding somewhere. The interference could suggest that the ground is not strong enough or loose, and not getting a picture at all means that signal is not flowing. If it is fixed by the audio cable, then the problem is with ground either on your motherboard or your screen.

                          Try in a desktop configuration
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                          • #14
                            Agreed. Sounds to me like it's grounding through the audio cable. Either your video cable is bad, or there's a loose ground somethere along the video signal. But of course, without seeing it, it's hard to say anything for sure...
                            "Is Wayne Brady gonna have to choke a b@$#*??!!"

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