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Thread: Engine Noise with M2 ATX

  1. #21
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    I have the same issues as gamer64.
    I hooked up a laptop to the vga and rca's and there is no noise on either.
    its only when run through my voom with a m2,so it must be the pc right?
    I am also geting clicking noisies when i touch the screen and the hd is in use.
    will a ground loop isolator or supressor help me?
    Also how do you check if the ground is good,or is it just trial and error?

  2. #22
    Maximum Bitrate david69leonard's Avatar
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    You can check the resistance on the ground with a multimeter for good continuity...

  3. #23
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    Ive been told by someone over at cartft to make sure my rebranded dww700fm is grounded to the chassis and not the battery.
    At the moment it is wired through the stock harness.
    Just wanna know what is the common grounding method used by car manufacturers for headunits?

  4. #24
    Newbie xcalibur's Avatar
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    i to am having this trouble the same as everyone else. but i dont think the screen noise is from anything in the car as i have taken mine fully out and ran it in the house of a psu and still got some screen noise.. so maybe we getting feedback from somewhere else not in the car... who knows .i am going to try a dc filter and a ground loop isolator and weill see what i can do as i am going to be redoing my trunk in a little whila nd use a second battery . but i will post any solutioni i come up with.
    P4 1.8GHZ, Ati 9800 AIW 128mb, WD 120gb hd, liliput 8" touchscreen, m2-atx

  5. #25
    Maximum Bitrate david69leonard's Avatar
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    Quote Originally Posted by Smartstradamus View Post
    Ive been told by someone over at cartft to make sure my rebranded dww700fm is grounded to the chassis and not the battery.
    At the moment it is wired through the stock harness.
    Just wanna know what is the common grounding method used by car manufacturers for headunits?
    Usually the stock wire harness will have a ground wire integrated with it, i wouldnt hook anything else other than the HU to this wire. I know if i hook my pc to this wire along with my HU i get alot of distortion and the same kind of noises as stated earlier. So your best bet is to ground all of your extra stuff (pc, EQ, ect.) to your chasis... It definately helps out.

  6. #26
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    Quote Originally Posted by david69leonard View Post
    Usually the stock wire harness will have a ground wire integrated with it, i wouldnt hook anything else other than the HU to this wire. I know if i hook my pc to this wire along with my HU i get alot of distortion and the same kind of noises as stated earlier. So your best bet is to ground all of your extra stuff (pc, EQ, ect.) to your chasis... It definately helps out.
    All i have is a pc and a screen in the hu.,
    the pc is in the boot about a foot away from my battery and it is grounded to a grounding point under my boot carpet.
    The screen and sound from the hu works perfectly when i hook it up to my laptop,(even wth the pc running right next to it.But as soon as i connect the vga and rca's to the pc the screen has noise and i get alternator whine.
    Even funnier still is the fact that the hu doesn't amplify the whine,it is at a constant level unless i have the volume between 72 and 76 and then it is reduced but still there.
    I tried an old noise supressor at the weekend but it didnt do anything.

  7. #27
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    Someone said that wiring directly from the battery isn`t the best way, could someone explain why that is, because it seems to me that that`s the most direct connection it can get.
    To clarify....grounding straight to the battery isn't a good idea. It's because the whole car should be your negative terminal and if you ground eveything to your battery there's only that small factory wire clossing the loop with the rest of your car. That's why when you add sterio/PC stuff to your auto, the grounding BIG 3 should be your next upgrade.

    1) Battery negative to chassis
    2) Alternator to battery positive
    3) Chassis to engine

    big fat braided grounding straps and thick *** 4 gauge minimum power lines.

  8. #28
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    ive tried grounding my hu (which has the screen built-in) to the same point as my pc and it reduced the screen noise a bit but not completely.
    Also tried grounding the outside of the rca's and the spacers on the mobo and that only lead to having alternator whine even when the pc was unplugged.
    I'm guessing that it has to be the ground on the pc causing my issues but ive run out of places to try and ground it in the boot.All potential points i have measured have come up at 0.1 on my MM.

  9. #29
    FLAC ShawJohn's Avatar
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    Unhappy More M2 issues

    Well my rebooting problems are 100% down to the M2

    ****ing thing needs about 8 or 9 cold boots to start the pc up, standby resuming is fine, but hibernations and cold boots are a pain!

    I makes it to the login screen, then goes back to BIOS Post, over and over.

    In the house on a mains PSU there is no issue, even in the car on an Opus90, with the same peripherals plugged in and using the same wiring the PC boots fine, EVERY TIME!

    ****ing M2

    Who's best to speak to about this?

  10. #30
    Maximum Bitrate LinuxRacr's Avatar
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    Quote Originally Posted by ShawJohn View Post
    Well my rebooting problems are 100% down to the M2

    ****ing thing needs about 8 or 9 cold boots to start the pc up, standby resuming is fine, but hibernations and cold boots are a pain!

    I makes it to the login screen, then goes back to BIOS Post, over and over.

    In the house on a mains PSU there is no issue, even in the car on an Opus90, with the same peripherals plugged in and using the same wiring the PC boots fine, EVERY TIME!

    ****ing M2

    Who's best to speak to about this?
    If you can get into the system, you may want to go to the control pannel, and do this before investigating further:http://www.compphix.com/rebootloop.html
    My Car: 2001 Mazda MP3
    My OLD Carputer project: Here
    Completion Progress Bar: [**********100%]
    Current build! Here
    Completion Progress Bar: [*********99%]

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