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Thread: Intermittent touchscreen problem :-(

  1. #1
    Newbie sigol's Avatar
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    Intermittent touchscreen problem :-(

    Hi hope somebody can help...

    My project is virtually finished. Will post final pics soon.

    I've got a liliput 7" touch screen and the problem is that the touchscreen facility is intermittent. I can hear the sound Windows makes when it loses or finds a USB device.

    There seems to be no pattern to this. It can happen at startup, not happen all day or happen just about whenever it feels like it. When Windows loses the connection, it can be down for seconds or for hours.


    The connections seem nice and snug. The only thing I can think of is that the USB cable goes in to a USB hub in the glove box so i can't rule out whether the hub is faulty or the screen. (However, when the screen goes down, the backup mouse and keyboard work fine - so probably not the hub then).

    Please can you help - it's putting a dampner on an otherwise great install. :-(

    Thanks in advance...
    Simon Goldstone
    Carputer Install

    Audi A4 1.8T S-Line
    Epia MII 12000 | 512 MB RAM | 300GB HD
    Slimline slot CDRW/DVD | Silverstone LC02
    WIFI | 3G/GPRS | Bluetooth
    Hauppage Digital TV

  2. #2
    Low Bitrate DaKyy's Avatar
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    I've got the same problem, this has occured after I installed the carpc permanently to my car. Before I had the case just bumping around the trunk and it worked OK. It usually starts to work when I shut down Lilliput and reconnect the monitor cable (usb&vga). Don't have a solution though.

  3. #3
    Constant Bitrate CapitaineFritz's Avatar
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    You can try:

    1- Without your usb hub... just to be sure
    2- Another computer (like a laptop), again just to be sure it's not the O/S
    Via Epia M10000 / 512 DDR / 10gigs 3.5 HD / M1-ATX / Innovatek 7" TS Screen
    Trunk fiberglassing in progress...
    Need GPS / Aux Input / WiFi

    My Corolla Computer

  4. #4
    FLAC IntellaWorks's Avatar
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    Whats the temp. Inside your car when its doing this problem?
    Progress [I will seriously never be done!]
    Via EPIA MII
    512MB RAM
    OEM GPS (embedded)
    nLite WinXP pro on
    1GB Extreme III CF card
    Carnetix 1260 startup/ DC-DC regulator
    Software: Still, re-Writing my existing front end in .Net

  5. #5
    Newbie sigol's Avatar
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    Guys, thanks for your replies.

    DaKyy: I know! it's frustrating. I had the PC in bits for a month to prove it all works and the minute I install it - this! arrghhh!

    CapitaineFritz: Will do - good idea about laptop - I will try and report back.

    IntellaWorks: I don't have the luxury of being in a nice warm country like you. I live in Manchester where it rains more than in any other city in Europe! It's a constant 19 deg C in my car and no more! It can happen at any time of day and under any environmental conditions.

    Best wishes,

    Sigol.
    Simon Goldstone
    Carputer Install

    Audi A4 1.8T S-Line
    Epia MII 12000 | 512 MB RAM | 300GB HD
    Slimline slot CDRW/DVD | Silverstone LC02
    WIFI | 3G/GPRS | Bluetooth
    Hauppage Digital TV

  6. #6
    Constant Bitrate
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    hmm this happened to me before and the reason for me was that my usb hub was not getting enough power. You can try to power the hub it it isnt already becasue a bus powered hub only gives out 100ma a port where as a powered hub gives out 500ma a port. The touchscreen draws 100 ma so my screen would stop working once in a while also. Hope that helped.

  7. #7
    Newbie sigol's Avatar
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    Hi colum3rider,

    Yes that certainly could be the problem. The hub is bus powered. I'll try powering it and see what happens.

    Cheers!
    Simon Goldstone
    Carputer Install

    Audi A4 1.8T S-Line
    Epia MII 12000 | 512 MB RAM | 300GB HD
    Slimline slot CDRW/DVD | Silverstone LC02
    WIFI | 3G/GPRS | Bluetooth
    Hauppage Digital TV

  8. #8
    Low Bitrate DaKyy's Avatar
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    I've tried plugging every other device out but still having the same problem...

  9. #9
    Low Bitrate DaKyy's Avatar
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    I tried to switch the touchscreen to another USB-port, and only kept the TS connected of my USB devices. Still the same problem occurs. It works for while and then it stops when I start the car next time. If I unplug the power cord from monitor and stick it back in, Windows seems to recognize it(you hear the sound) and instantly you hear the disconnect sound.

    Next I'll try the TS drivers, and after that I'll probably verify that the USB-connection is OK from the monitor end. The cable from front to boot is good as the USB keyboard works ok when it is connected.

  10. #10
    Low Bitrate DaKyy's Avatar
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    OK, the TS is fixed now - until the next time the problem appears Probable cause is the cord from screen that is connected with that weird, tightening thingie

    So, Sigol, Test your USB cable is ok, and after that try reconnecting the screen cable...

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