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Thread: Lilliput Power Button Rebooting CarPC

  1. #1
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    Lilliput Power Button Rebooting CarPC

    Hi Guys.. Been searching for an answer on this one and haven't found too much on the topic. Hopefully someone here has an idea what may be happening with my system.

    I did my install last weekend, and everything powers up fine, but I've been having this weird problem with resuming. I am powering my Lilliput display off of my M3-ATX PSU via a soldered in molex connector. When the system boots from a shut down state, it comes up fine, and I don't have any issues. I have it set to hibernate when the engine is shut off, which works fine as well. The problem is when the system is to resume, I'll see the Lilliput's "RED" indicator light come on about 5 seconds after I start the car, and 20 seconds after that, music will resume playing where it left off when the system was powered down, the only issue is the screen never turns on and maintains it's red "I'm getting power" light. If I put the power button on the lilliput it shuts down the whole system. Subsequent presses of the power button (I'm not sure if they're required or not) will reveal "no vga input" or something to that extent, the monitor completely shuts off, and then the "red" light appears again. Eventually, the system boots and I get the whole "Windows did not shut down properly.. what would you like to do?" dialog, and it boots into Windows. Can anyone tell me why the Lilliput is able to shut down and possibly reboot the whole system via it's power button? I have the feeling I'm missing something incredibly stupid. I appreciate your help...

  2. #2
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    what kind of components are you use for your pc?
    It almost sounds like a display driver issue to me, maybe try updating that.

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    Thanks for your reply.. it's definitely not a driver issue. I believe it has something to do with the load being put on the psu. It can't handle the fluctuation in power (being turned on or off --- either one will result in the system rebooting)

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    there was a recent thread form someone else with a similar issue-- i recommended attempting to power the scren off the car to check weather it is a screen, or pc issue, and haven't heard back yet..

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    It definitely works when the screen is powered off an alternative source. The PC itself is fine, as I can removed it from the car and run it off a regular PSU in the house without any problems at all. I don't want to jump the gun, but I'm starting to feel that all signs point to the M3-ATX not being able to handle the load of a monitor being powered off of it, even though the monitor is documented to draw a maximum of 8 watts. Again, I absolutely do not have a monster system... I'm really surprised that the M3 can't handle it.. I actually read in another thread that a guy with the M4 is having the same problem....

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    That is odd, I figured since it had the red light that it was receiving adequate power, just never got the wake up signal.
    If it works off of another source without issue, then I'm pretty confused as to what to tell you. Like you've said, the M3 should be able to handle it without issue.

  7. #7
    MySQL Error soundman98's Avatar
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    while it is odd, i would just connect the lcd to a vehicle power source.. while i would really like to know 'why' it isn't working, as a consumer, i doubt there is much i could do to the power supply to correct the issue..

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    Today for some reason, it decided to behave itself and come up with the system 7 out of 8 times I started the car. One of the times it came up (monitor had green light.. music started playing) with no picture after the initial intel bios boot screen. Weirdness. Anyway.. someone mentioned in another thread that the length cable run powering the monitor (and such a small gauge wire.. as I only extended the stock Lilliput cable to the trunk). I'm an electronics novice, but he mentioned something about the resistance being too much for the power supply... still don't know. Perhaps an upgrade to the M4-ATX may help. The guy having problems powering up his screen with the M4 was running a Core 2 Duo... probably more demanding than my intel atom processor....

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    what gauge wire are you running to the monitor? How long is the wire?
    The fact that the light turns on makes me wonder still though. My m4 powers my i3, two hard drives, random stuff, and my lilliput without any issues.

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    I'm not sure of the gauge of the wire used in the stock lilliput power adapter that I tapped, mayb 20 or so. Whaever gauge it is, that's the bottleneck. I extended those wires 12 - 14 feet using 18 gauge. Also, I'm using an M3 not M4.. so I may need to upgrade. What kind of enclosure do you use to house the M4?

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