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Thread: Car PC lots of "noise", good USB attached sound?

  1. #11
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    yes it is

    FYI i had a crash in the UK ice recently so got to fix that first before i can continue with the carpc.....will be back here after the cars fixed tho

  2. #12
    Aze
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    USB problems with VIA chipsets is very wellknown.
    You have to install the VIA USB driver, instead of Windows integrated USB driver.
    Even though Windows claims that it's own driver is better, use the "older" VIA driver.
    It's on the cd-rom for the motherboard...

  3. #13
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    i will try that when the weather thaws out a bit...and when my car situation is a little more positive, but many thanks for that heads up.

  4. #14
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    You're welcome. Please give a reply when you have tried..

  5. #15
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    ok guys, it loooks like i should be getting my car back tomorrow after 6 weeks in repair!!! pockets will be 1k lighter

    buuut id still like to sort the car pc problems....

    so to be clear as i havnt been on here in a bit, i should ground the car PC to the chassis, and install VIA usb chipset drivers.

    a few Q's where od i get hold of the VIA drivers? and will splicing the motherboard-PSU ground cable with a cable bolted to the chassis be ok?

    also there is scrolling interferance on my 8" touchscreen, but ONLY when its in the car, not when it isnt, what noob mistakes am i likely to have made to cause this?

  6. #16
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    Great to hear that you're on it again.

    There are a few things you shold do, to be able to eliminate the noise-problems.

    First of, install the VIA drivers for the USB. This makes the internal "connection" to the USB port better, and clicks/pops in the sound won't appear.

    Second, and what is actually most important....The ground-potentials in the car needs to be 100.00% the same. This means that ALL items that contains a sort of swithcing circuit has to be grounded REAL serious.
    It is not enough just to connect the cable tire to a bolt/screw. It has to have directly connection to the chasis of the car. And you have to scratch of all paint/laque at first.
    Use a Dremel for this if you have. Like on this picture:


    you see...clean metal surface. Really important. Then you can connect you're cable tire to it, but be sure it is connected directly to the chasis, not just on some plastic containing a bolt. That's not good enough.
    DIRECTLY to the cleaned metal surface:


    Also you should check the ground-connections on the car-pc itself. If the connections to the PSU are not very good, this also makes it a bad ground connection. The best way is to solder the wire to the terminals on the PSU. Then there will be a 100% connection.

    Also your amplifier's ground connection is DAMN important. If this has a too bad ground connection it can damage the connected audio-system (car-pc) as it will draw a current through the line-cables, because of the linecables gound/shield connection.
    So for the amplifier, use the right cabletires, and make SURE that they are mounted using a real crimbplier. Not just a little parrot plier.

    Last but definitely not least, the ground connection from the car-batteri to the chasis is very important. Even though there IS a heavy groundwire for the battery, it's not good enough. Make a new one using some real heavy car-stereo ground cable, and make sure to scratch of all painting etc, before connecting it to a ground-point. Also you can upgrade the ground-wire to the alternator/motor.

    For the screen interference it is caused by a bad ground potential somewhere.
    Please do all the upgrades as mentioned, and then get back with the new status....
    Then we will find the screen-problem if it still appears.

  7. #17
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    thankyou for a very detailed and halepfull reply, i will endevour to do all of these, my amplifiers are grounded in such a way (spare wheel well, used dremel to scratch surface offf and bolted down, good proper contact) but the car PC and screen are just daisychained off of the old HU wiring, not bolted ot chassis....so will do that, and i will solder another wire to PSU and connect it to ground.....but none of htis yet...

    just got the car back, headlights pointing at the floor, uneven gap all way round on the bumper, pulls to the left and engine managment light on.....needless to say, its going back in....

  8. #18
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    A shame about the car. How can they spend 6 weeks not finishing it complete?

    When the basic problems with the car are solved, go ahead with the upgrading ground-point work.

    Good luck...

  9. #19
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    oook, so got the car back and every thing is good, so cracked on with the car pc, nowww using the creative x-fi and a 15000 delay, under windows 7, the pc will hibernate and resume FLAWLESSLY and resume playback with no problem (also in conjunction with Xport)

    i have soldered a cable to the ground on the motherboard, and bolted this to a good clean custom made earth point on the firewall (tested for PD with multi meter), also did the same with the screen (got rid of the majority of the scrolling lines) and i also connected the RCA barrels to ground, but i still have a very high pitched alternator whine, can anyone shed any light??

  10. #20
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    The very high pitched sound...is more like a ground or lose rca jack problem. Also check your Amp rca and ground...and make sure that your rca jacks is not close to any 12v. Or try a better set grade rca's also better 3/5 to rca.

    Also remove that ground loop isolator...those things add problems.

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