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Thread: Finding those damn gremlins

  1. #1
    Maximum Bitrate nasa's Avatar
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    Finding those damn gremlins

    Hi,

    I am trying to chase an on-going issue that has baffled me for a LONG time. Hopefully, the smart people on the forum will be able to point me to where I should be looking...

    I will describe issue by taking us on a step-by-step of an event:

    1. Start up Car
    2. Computer starts (Fans audible)
    3. BIOS displays
    4. GRUB displays
    5. Crash/lock-up or something that causes system to halt
    6. Hit the shut-off switch (which is on the ACC line)
    7. Wait the 2+ minutes for the system to totally shutdown (fans off)
    8. Hit switch
    9. Computer *starts* (fans audible)
    10. Nothing
    11. Repeat #7, except wait 10+ minutes
    12. Hit Switch
    13. Computer starts (Fans audible)
    14. BIOS displays
    15. GRUB displays
    16. Working system

    A side note: after #5 other things stop working as well. Specifically, my rear camera and the switch tied into my GPS unit (see my worklog on that) -- both of which are tied into the ACC line.

    There's 2 identied problems -- they system locking up and whatever you want to call the 2nd event. Today's question is on the 2nd event. I'm not sure how the system locking up is linked to my reverse camera stopping working.

    So, any ideas???

    BTW: I am using an M3-ATX as my DC-DC adapter.

  2. #2
    Variable Bitrate
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    maybe its a cable related problem. can you tell some more about your install?are you using any relays?? OR, the battery might not have enough power at start Up OR the DC adapter's capacitors might need some time to fill up... i'm no expert though

  3. #3
    Maximum Bitrate nasa's Avatar
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    Settra,

    Who says you not an expert?

    The only relay I have put in the car is the one connected to my GPS (http://www.mp3car.com/worklogs/11769...worklog-4.html). The battery is a relatively new yellow top. I need to update my powerpoint slide on my install -- the ones on my worklog are out of date! Look for my to add a new one shortly.

  4. #4
    FLAC -zip-'s Avatar
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    Can you pull the PC out of the car and run a standard power supply in the house? See if the problem persisits. Also run a meter and see how close the threshold is for auto shut off on your PS. Winter has been mild but have seen a big drop in available amps/voltage from yellow tops in the past rather quickly. (just my personal experience) in the past during and after cold winters.
    2008 350z GT Installed since April 22nd 2011 - Worklog
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  5. #5
    Maximum Bitrate nasa's Avatar
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    Zip,

    I have run this system for a good bit on my *workbench* and haven't seen this issue. As far as using voltmeter... I'm not sure how in practice I would go about finding that threshold vs what the battery is providing -- without monitoring it like continously for a good amount of time. How would you go about it?

  6. #6
    Variable Bitrate
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    if it works in the well on the bench, then its either battery or the DC adaptor.. battery can be checked pretty easy though!

  7. #7
    FLAC -zip-'s Avatar
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    I use aligator clips and wire. (test wire), Radioshack sells them in packages. Hook up the meter just before your 12v + and - hits the power supply. Do you find the issues are the same if you drive for a long time then stop for short time (getting gas for example) vs starting the car up in the morning?

    What you want to test is how much voltage is hitting your PS at startup/crank. This will eliminate or show any issues from the battery to the PS. Voltage will run less than 14.4v get that number look up what the minimum start up is for the Power Supply, what threshold you have set if any or what is the default if you can set this or call the manufacturer and ask.

    So what is the voltage in?
    What is the minimum set by the user or default Power supply setting?


    Not saying this for sure is the problem, its one big piece to eliminate.
    Last edited by -zip-; 02-08-2012 at 12:43 PM.
    2008 350z GT Installed since April 22nd 2011 - Worklog
    2000 Protege Installed Since April 2, 2005 - Intel D201GLY|Fusion Brain|ODBPros ODBII|Engenius|GPS Rikaline|Powermate|Motorized Lilli
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