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Thread: Carputer finally installed....but it won't boot

  1. #11
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    Before we go there I figured something out. I just scoured my PSU for an LED and found it so I went outside now that it's darker and I know where I'm supposed to be looking and I noticed the LED on the mobo is on and the LED on the PSU is flashing about once ever 10 seconds which means "Battery voltage is below normal operating range."
    That's an odd one since I have a tuner that connects to my ODBII and it measures my normal voltage as 11.5 default is 12.5 so it makes sense that it wouldn't boot then but I even started it up to bump it up to 14.5 and it still wouldn't start.

    I'm going to adjust the jumpers tomorrow and see what happens.
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  2. #12
    FLAC
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    make sure your battery is above 12V just to be sure that you're not under the low voltage threshold.

    Connect the psu to the car, make sure there is a valid acc/ign signal and power (check with volt meter).
    for now you can connect the mb on/off switch to the case's button, and press power and see if you can start the computer.

  3. #13
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    I tested the ACC line with a multimeter and it's showing exactly the same as my tuner (11.47V), I adjusted the jumper to allow it to boot on 11V, and I used my desktop power button. Still no go.

    EDIT: The PSU is now flashing twice, then 3 times, then it goes out for a few seconds. There's nothing in the manual about 2 then 3 so I'm assuming the issue is both 2: "The computer power up sequence failed." AND 3: "Power supply output voltages are out of normal voltage range."?

    The solution to 2 is: "Check the wiring of the two wire power-switch cable from power supply connector J9 to power switch pins on the ATX motherboard. If connected properly check the polarity of the power switch pins, may be reversed."
    That makes sense since I'm using the desktop push button the PSU one isn't even connected.

    EDIT: Just to make sure, I reconnected the switch cable from the PSU and it got rid of the 2 flashes. Now I just have the 3.

    The solution to 3 is: "Power supply output is over loaded or shorted or faulty DC-DC power supply. How would I go about fixing the first one?
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  4. #14
    Neither darque nor pervert DarquePervert's Avatar
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    You need to determine the power draw of your system and make sure it doesn't draw more than the individual rails of the 120w Opus PSU.

    Based on the specs in your worklog, I'm certain your PSU doesnt' have enough output to power your system, especially with that video chipset.
    Also - Remember that AMD CPU's draw from the 5v rail, and the Opus 120w only provides 8A on the 5v rail.
    8A x 5v = 40w.
    Your CPU alone can draw more than that.

    Yet another case of poor planning resulting in hardware that isn't compatible.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  5. #15
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    Quote Originally Posted by DarquePervert View Post
    Also - Remember that AMD CPU's draw from the 5v rail, and the Opus 120w only provides 8A on the 5v rail.
    8A x 5v = 40w.
    Your CPU alone can draw more than that.
    Ya, 45W. I didn't know it used the 5V rail. I offered my PSU suggestion to others and they said it would be ok, so I went with it. Anyone want an OPUS 120W?
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  6. #16
    Neither darque nor pervert DarquePervert's Avatar
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    I have to point out that you relied on the suggestions of random anonymous people on an internet forum instead of doing your own research to be sure.

    I'm just sayin'....
    Have you looked in the FAQ yet?
    How about the Wiki?



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  7. #17
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    Ya, but that's why this post is in the newbie section. Live and learn I guess. Even the 360W only has 75W on the 5V rail. I guess the CPU is my biggest problem here.
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  8. #18
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    Quote Originally Posted by DarquePervert View Post
    I have to point out that you relied on the suggestions of random anonymous people on an internet forum instead of doing your own research to be sure.

    I'm just sayin'....
    Funny, research tells me that my CPU runs off the 12V rail since I have the 4 pin molex connector on my mobo.

    3.5A x 12V < 45W, but still.
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