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Thread: Car PC freezes when i hit a bump or when bass hits with a SSD

  1. #11
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    Quote Originally Posted by ClockWorK View Post
    When you say that the PC "freezes", does that mean it stops playback for a moment and then resumes, or does that mean the system crashes and needs to be rebooted?

    Im trying to respond to you guys but my posts are being moderated and they seem to take a day to be posted.. anyway the system crashes and needs to be rebooted im left with a frozen image of what was on the screen when it froze.

  2. #12
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    Quote Originally Posted by Rickk View Post
    You can sort out an intermittent ground by putting a 1 amp or so fuse between the PC ground right at the PC and a good chassis ground separate from any other ground. If you find a blown fuse, the current ran thru the fuse instead of the "regular" ground.
    Nice trick Rickk, I'm going to save that one for my bag of troubleshooting tests!

  3. #13
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    Quote Originally Posted by Rickk View Post
    You can sort out an intermittent ground by putting a 1 amp or so fuse between the PC ground right at the PC and a good chassis ground separate from any other ground. If you find a blown fuse, the current ran thru the fuse instead of the "regular" ground.
    I originally misread that and thought you were proposing replacing the PC ground with a fuse. I was going to advise that that can be very damaging - losing power ground can mean other ground path are taken, hence frying circuits (like audio, USB, monitor feeds etc).

    BUT this (fuse) is in addition to the PC ground. Hence if the PC ground was breaking, the alternate ground PC paths should already be fried if that was an issue, though they might not fry if the the break is short.
    A 1A fuse should take about 0.3 secs to blow at 10A. If that is too slow, use a smaller fuse (a 250mA fuse blows in about 10mSecs @ 3A).

    Normally a bulb would be used for finding broken ground faults, but since this is obviously a short duration problem (a freeze and not a reset etc), a bulb or LED lighting may not be noticed. Besides, the thing you hit whilst watching the bulb or LED is usually a bigger problem than the PC freeze. (I'm just being pragmatic, not egotistical.)

    In conclusion, I'm with rray on this - nice one Rickk!!


    Keep in mind it could also be in the +12V feed, though the M4 should ride thru short breaks, but a loose or bad connection in its circuitry or output wiring might be worth consideration... And then we get into all sorts of +12V and internal M4 issues (it senses a low voltage so it cuts supply??) and even the PC itself (as per SATA etc connections).
    But the GND is the easiest and a very likely culprit. I think changing to - or adding - another GND is a good idea.
    That fuse test is great if it shows that it is the current ... er, present GND that is the problem.

    BTW - don't forget the usual tips - disconnect and reconnect all connections, and rotate fuses of the same value (rotate with a spare if it's a unique fuse size).

  4. #14
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    It does sound like a loose connection or something in your system is rattling apart.

    Although modern computers are better with things rattling around they are not normally made for in car use and you could even be having an issue with your PCI sound card rattling around and moving around in the socket.

    You will want to make sure all of the components that are not soldered onto the mother board are solidly mounted so they will not come off or come loose. Something as simple as a broken pin on the CPU heat sink so only 3 pins are holding it in place could cause issues as could quite a few other things. If you have very powerful bass you can rattle things apart quite easily. Any socketed chips either on the board or in your system could also be shaken apart in the socket. You may want to go around to every component in your system and make sure all chips and boards are solidly in their sockets and that all retaining hardware is fully in tact. If you do not find a wire issue then you may want to look into a different motherboard combination. You will be surprised at how much more durable a system with the sound and video on board will be since they can't be shaken up. I recently bought a "tough duty" motherboard for my build and it should work well. Another forum user is using the same board I am as well. But there are some boards out there available quite cheaply that have everything already mounted on board for you including the processor and you will have far fewer issues with them.

  5. #15
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    Not sure how I missed the fact the title said ssd, that makes my earlier comment useless. lots of good information in this thread though.

  6. #16
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    No! that_kid, you obviously meant its connections - just as I and probably we all interpreted it.
    Unless you also meant an internal connection or "cracked" chip (track), but I don't want to go there - at least not yet! Grounding first, ssd/hdd swap comes MUCH later!

    PS - Funny, yesterday I wrote about (the power of) Brainstorming on the12volt. (And about those that scoff suggestions when brainstorming in companies/businesses.)
    Last edited by OldSpark; 03-14-2013 at 05:17 PM. Reason: PS...

  7. #17
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    I would probably try to reproduce the problem. Run the PC, and gently but firmly wiggle the SATA connections. Then the PCI card. Then the RAM. Then power cables. Anything else with a connection that could come loose.

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    tomorrow will be the day this problem is solved im going through eveything and ill be making a new ground for just the computer ill let you all know what happens and thanks all for your advice

  9. #19
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    Quote Originally Posted by ClockWorK View Post
    I would probably try to reproduce the problem. Run the PC, and gently but firmly wiggle the SATA connections. Then the PCI card. Then the RAM. Then power cables. Anything else with a connection that could come loose.
    If you do this however be VERY careful.. You can blow your whole board easily if you wiggle something where it shorts out something...

    Just as I hope you realize my suggestions were made for a system unplugged from any power source... Although you should use a grounding strap and hook it to the case of the computer to drain off any static electricity.

  10. #20
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    Screw it. Throw caution to the wind. It's a computer in a freaking car. Things are going to shake, rattle, and wiggle. If it somehow does fry your motherboard, you just bought one hundred dollars worth of knowledge.

    Who says knowledge is priceless?

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