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Thread: Lilliput 8" HDMI makes my PC crash when powered off via on/off switch

  1. #1
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    Lilliput 8" HDMI makes my PC crash when powered off via on/off switch

    I've recently updated my setup to add a few commodity to my carpc but one issue came up with my monitor and PC.
    A little background on the system,
    I'm running a lilliput 869 series monitor (I think). It's connected to a HDMI from the monitor to the PC.
    12v is coming from the PSU, all the way to a on/off switch and to the monitor
    Ground is coming from the monitor to the PSU

    Everything works fine until I witch the switch to the off position, which causes my PC to crash and reboot in the recovery menu.

    my guess is something to do with a driver on the HDMI part, this is new for me since I've never really done something like that before. I wanted to have a switch on/off for my monitor for those times when I want the monitor off. My lilliput is out of it's enclosure and I'm using a custom enclosure for my accord so the monitor buttons were removed.

    If anyone could shed some light on this, that would be great. Also, if my current setup is incorrect, how can I design it to have the ability to turn the monitor on and off via the switch without causing my PC to crash?

    Thank you

  2. #2
    Maximum Bitrate Mickz's Avatar
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    Do you get an indication that the PC is about to crash or does it appear to loose power and then repowers on in recovery?

    What does it do if you just unplug the HDMI cable. I'm wondering if you have a switch problem that's spiking 12v from the PSU in some way and causing the PSU to reset. Just trying to suggest the simplest things first.
    GA-Z77N-WIFI, i5-2400S, 8GB, Intel 520 128GB SSD, M4-ATX Modified, 2 Rev Cams, 2 Web Cams
    8" 16:9 TRANSFLECTIVE, Win8-64, Dual GPS RX and Garmin PC + Odyssey Nav, FM-DAB+, BB-Rec
    T-Screen HVAC control, custom microcontrollers, code and FE. CarPC Project

  3. #3
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    Thank you for the advise. I did as you suggested. I've put a series of troubleshoot that should help eliminate some possibilities
    1- I connected the monitor with a seperate power supply using the 12v 1a dc adapter that came with the monitor. When I unplug it, from the monitor, my computer crashes (By the way there's no way to see what happens when it crashes since the monitor is off, but basically when I unplug it and plug it right back, the monitors stays blue with no signal and about 3-5 seconds later I'll see the bluetooth light turn off and on again, showing that the PC is restarting, then I'll get the screen that says start windows normally or in safe mode.... and after the boot I get the windows have had an unexpected shut down...)
    2- I distonnected the HDMI cable while the PC is running. Nothing happened there, once I plugged the HDMI back in, the PC was were it was left off. So that part is ok
    3- While the monitor is connected to the seperate power supply, I connected a 12v 1a device to the connector I usually use for the monitor to test if there's a short or spike. I plugged a router I had kicking around. Plugging and unplugging it did nothing bad, computer ok. I also tried the on/off switch while the device is plugged in and no problem, the device turned off and on while the PC still running.

    Unless there's more troubleshooting I could do to test more possibilities, it appears that the monitor does not like to loose power while connected in the HDMI. Could there be something with the HDMI that freaks out the PC when it looses it's client? Is that something common with lilliput? or any monitors? I tried googling it but no help.
    I know Lilliput has a built in on/off button on the case which doesn't completely kill the power on the monitor but I have no way to make use of that.

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    I wonder if this could be a corrupted driver on the videocard? It's just an integrated VC from the sapphire E350 mobo. The whole reason why I'm re-doing the project was since something unexpected happened and my carpc randomly stopped working, I had to take it out of the car, but a lot of the programs are working funny now, like for example, when RR loads, now it doesn't adjust to the right size, it only fills up part of the screen, similar to if you were to connect it to a bigger screen. I've tried editing the general.ini file but that didn't work,

  5. #5
    Maximum Bitrate Mickz's Avatar
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    Starting to sound like a driver issue isn't it. FYI nothing I do with HDMI or my monitor will crash the PC in the vehicle. I run dual HDMI in the Home and nothing I do will cause a crash there either. I do however find some strange resolution and display size interactions on HDMI with the small 8" car LCD and the driver/display settings in Win (8.1 64).
    GA-Z77N-WIFI, i5-2400S, 8GB, Intel 520 128GB SSD, M4-ATX Modified, 2 Rev Cams, 2 Web Cams
    8" 16:9 TRANSFLECTIVE, Win8-64, Dual GPS RX and Garmin PC + Odyssey Nav, FM-DAB+, BB-Rec
    T-Screen HVAC control, custom microcontrollers, code and FE. CarPC Project

  6. #6
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    I did a little more digging, Turns out if I run my windows 7 in safe mode it doesn't crash... I tried turning the switch on/off a few times and the computer resumes no problem... It starts to feel more and more like some software/driver/firmware issue but I'm stuck now... I'm installing a fresh copy of windows and will follow up

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    I should further expand, it looks like RR is working fine in safe mode too. the resolution is displaying properly... strange....

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    Cant explain it. I reformatted my pc with a fresh copy of windows 7 and everything is fine now, pc doesnt crash when i turn off the power to the monitor. That was weird...

  9. #9
    Maximum Bitrate Mickz's Avatar
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    Actually Driver corruption or even the sequence that drivers are installed into the system can so that, sometimes it's Windows but most times it's badly written drivers and not necessarily the failing driver but the effect of poorly written drive installation for other drivers that can cause an unrelated driver to fail.

    Glad you solved it, make an image.
    GA-Z77N-WIFI, i5-2400S, 8GB, Intel 520 128GB SSD, M4-ATX Modified, 2 Rev Cams, 2 Web Cams
    8" 16:9 TRANSFLECTIVE, Win8-64, Dual GPS RX and Garmin PC + Odyssey Nav, FM-DAB+, BB-Rec
    T-Screen HVAC control, custom microcontrollers, code and FE. CarPC Project

  10. #10
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    I suspect it could have been something with the ATI catalyst with regards to the HDMI and audio. On the fresh install, I've installed the catalyst sw and when I turned off the monitor, a pop up screen would come on regarding the audio settings. I've then reformatted my PC again and this time didn't install any videocard drivers and sw and just left windows update to the basic updates. Everything is working well now. I suppose this thread is closed until someone else finds a similar issue.

    Thanks for all the help!

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