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Thread: Does EPIA M1000 use the 12v rail?

  1. #1
    Clover Grayscale's Avatar
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    Does EPIA M1000 use the 12v rail?

    I'm sorry, I searched and didn't see any answers, so if someone knows off the top of their head let me know please.

    I'm prety sure it doesn't use it, but dunno.
    CarPC install is starting to come along again...

  2. #2
    Clover Grayscale's Avatar
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    bumpity bump you guys don't want me sending 14.4v to my EPIA if it uses 12v rail do you? well thats what i'm doing! I have no 12v devices and i was told m1000's don't use 12v rail and its been working fine for a while, i'm just hoping it doesn't die a lot earlier than it is supposed to. and it wont if its not using the 12v rail. so someone tell me so i can sleep tonight
    CarPC install is starting to come along again...

  3. #3
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    Hey Gray. I hope you got your answer on this one by now. I am setting up almost the exact same system as yours. I thought the motherboard was on the 5V or 3.3V line, so if I used all 5V USB/internal devices I wouldn't be using the 12V line at all. and Voila! no car power fluctuation issues right? Wrong.

    I found this spec sheet on Via's Web site. Here's a snapshot of it. While measuring MP3 and application playback it measures a 12V load as part of the Watt consumption. So I it looks like the 12V line is always in use.

    Here's my link to the whole document: www.cs.uml.edu/~jhaas/carputer/epia_m.pdf

    The watt measurements begin on page 11.

    Here's a snapshot of one of the Watt measurement screens:



    Well, good luck and I hope you didn't fry your system.

    Jim

  4. #4
    Maximum Bitrate mushin's Avatar
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    Does that chart include components like HDs, which take 12V? No draw on 12V at idle would seem to suggest to me that the MB itself may not be using it.

    Only one way to really find out See if there's any current flowing through the power connector's 12V line during use. It'll require you to cut the wire, but that should be easily repaired.

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    Actually, I guess that was a bad part of the screen to cut that pic off at. It kind of leaves the impression there's no watt consumption at idle. This isn't the case. Here's the top of the next page. You can see watts are being consumed at idle on the 12V line as well as the other lines. Oh well...


  6. #6
    Clover Grayscale's Avatar
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    Well crap haha. I'm actually getting 12.8 or something volts because I used a couple of diodes to drop off the voltage coming in, and since I have a tank circuit it only goes down to like 11.7 volts. I think 12.8 is within tolerance, and am not going to worry about it . Seems to be fine!
    CarPC install is starting to come along again...

  7. #7
    Maximum Bitrate mushin's Avatar
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    Yeah, a clean 12.8's probably fine. I'd be worried if you were running 14.4 like you initially state tho!

  8. #8
    Clover Grayscale's Avatar
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    yeah that was before i checked my voltages and i forgot i had put some diodes in to drop that voltage down
    CarPC install is starting to come along again...

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