Results 1 to 7 of 7

Thread: Strange power hiccup on m2-atx when turning my car off.

  1. #1
    Mo' Programming Mo' Problems
    Auto Apps:loading...
    Sonicxtacy02's Avatar
    Join Date
    Sep 2004
    Location
    Woodbridge, VA
    Posts
    8,173
    Blog Entries
    53

    Strange power hiccup on m2-atx when turning my car off.

    I recently changed my car PC installation over to another motherboard and as a result changed my power supply back to the m2-atx. Keeping all the components (Power, USB etc) the same i figured it'd be an easy deal. I am now having a problem that i really dont know where to begin troubleshooting. Basically the power to my car PC dips down to <9volts whenever i take my key out of the ignition. It only happens for a second before the multimeter jumps back up to 12v, but its long enough that the m2 cant compensate for the dip and keep my system alive. I can hear the processor fan speed slow for a second before it picks back up and the computer reboots.

    The thing thats kinda baffling me is this really shouldn't be happening. Both of my batteries are less than a year old and the auxiliary battery powers nothing but the car PC and a single (but new) amplifier. I never run the system with the engine off and both batteries still test fine. So where should i start checking? Could a loose wire cause the problem? Again, i'm using all the same wiring, same battery isolator etc. What could cause a dip in detected voltage from a healthy battery?
    Last edited by Sonicxtacy02; 05-27-2011 at 09:14 AM.
    mp3Car.com Senior Tech Blogger (Want a product reviewed? Contact me.)
    Find my plugins on the MP3Car App Store!
    Follow Me on Twitter or Facebook
    Live mp3Car Facebook Chat

  2. #2
    MySQL Error soundman98's Avatar
    Join Date
    Jan 2008
    Location
    on the border of northern IL/IN
    Posts
    5,820
    so if you turn the ignition off, but keep the key in, the power stays around 12v? but as soon as you pull the key out, it momentarily drops?

    i wonder if it is a worn ignition assembly causing a brief short.

  3. #3
    Mo' Programming Mo' Problems
    Auto Apps:loading...
    Sonicxtacy02's Avatar
    Join Date
    Sep 2004
    Location
    Woodbridge, VA
    Posts
    8,173
    Blog Entries
    53
    actually i was wrong.. i just did tests, the power dips when the ignition is turned off, regardless of the key still being in the cylinder.
    mp3Car.com Senior Tech Blogger (Want a product reviewed? Contact me.)
    Find my plugins on the MP3Car App Store!
    Follow Me on Twitter or Facebook
    Live mp3Car Facebook Chat

  4. #4
    MySQL Error soundman98's Avatar
    Join Date
    Jan 2008
    Location
    on the border of northern IL/IN
    Posts
    5,820
    ok, does the power also dip when you turn the ignition on?(if something is shorted inside the ignition)

    it really sounds like a car problem more-so then a pc issue...(maybe check your cars forum, or a local dealership?)

  5. #5
    Mo' Programming Mo' Problems
    Auto Apps:loading...
    Sonicxtacy02's Avatar
    Join Date
    Sep 2004
    Location
    Woodbridge, VA
    Posts
    8,173
    Blog Entries
    53
    Yes, it also dips during crank. I figured it had to be something with the PC because i never had such problems with my prior motherboard and DSATX power supply
    mp3Car.com Senior Tech Blogger (Want a product reviewed? Contact me.)
    Find my plugins on the MP3Car App Store!
    Follow Me on Twitter or Facebook
    Live mp3Car Facebook Chat

  6. #6
    MySQL Error soundman98's Avatar
    Join Date
    Jan 2008
    Location
    on the border of northern IL/IN
    Posts
    5,820
    not while the motor cranks, but as you are turning the key from 'off' to 'acc', or 'run'

  7. #7
    Mo' Programming Mo' Problems
    Auto Apps:loading...
    Sonicxtacy02's Avatar
    Join Date
    Sep 2004
    Location
    Woodbridge, VA
    Posts
    8,173
    Blog Entries
    53
    Going from acc to on is fine
    mp3Car.com Senior Tech Blogger (Want a product reviewed? Contact me.)
    Find my plugins on the MP3Car App Store!
    Follow Me on Twitter or Facebook
    Live mp3Car Facebook Chat

Similar Threads

  1. Power loss when turning key from IGN to Off
    By borikru in forum Power Supplies
    Replies: 6
    Last Post: 05-04-2009, 04:43 PM
  2. carpc not turning on with power supply
    By pnyboy27 in forum Power Supplies
    Replies: 28
    Last Post: 01-28-2008, 11:04 PM
  3. M1-atx power supply not turning mobo on!??
    By XCESIV in forum General Hardware Discussion
    Replies: 3
    Last Post: 12-20-2007, 01:33 PM
  4. computer not turning on, prob power supply
    By warnockm in forum Power Supplies
    Replies: 1
    Last Post: 05-11-2006, 10:00 PM
  5. hiccup in mp3s
    By Mike12086 in forum Centrafuse
    Replies: 2
    Last Post: 12-12-2004, 11:01 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •