How I can remove VEE (option)

    Hello,


    We receive the NetDCU8 board with VEE option (K) for the contrast management.
    With K option R20, R22 are short ciruit and R17, R21 are open circuit (P1 is present).
    We generally use NETDCU8 without VEE option (K). I think there was an error on the order.
    Now I want to desactive this option because, i use VCFL12V to manage my backlight and it don't reacte in the same way.
    If I put just R22 in open circuit it doesn't work.
    What I can remove (the potentiometer P1, the 2 resistor beside P1 ?)
    If you could send me a picture of the component to remove, you would be very helpful. We are a little blocked for our production


    Best Regards

    Which pins of J3 do you use?
    If you use a NetDCU8 without contrast voltage -Vee, +Vee and Vadj (pins 26, 27, 29) have no function, only Veek (pin 18) outputs 0-3.3V.
    On NetDCU8 with contrast voltage pins 26, 27 and 29 can carry up to +-30V and the Veek signal is used to adjust these voltages.
    So if you use Veek for your backlight there is some influence to this signal from the voltage regulator.

    F&S Elektronik Systeme GmbH
    As this is an international forum, please try to post in English.
    Da dies ein internationales Forum ist, bitten wir darum, Beiträge möglichst in Englisch zu verfassen.

    Hello,


    I continued my research, I don't think, that it's a hard configuration issue finally.
    I reinstall an older kernel version V1.41 (090121) and it works perfectly.
    When I reinstall the kernel version V1.47 the problem come back.
    My problem is that my screen become black when it enters backlight mode.
    The contrast or the brightness goes to minimum (off) but the backlight is OK.
    I use the registry to enable ACBacklightOff, it seems that a registry
    must be modified.


    It may come come from PSS driver (kernel V1.44) ?


    Best regards

    Hello,


    - you can disable PSS driver by set corresponding registry value "flags" to "4".
    - do you need contrast voltage at all? Else set displays drivers "enablecontrast" registry value to "0".
    - if you don't like to set PSS value "flags" to "4". I think follwing setting does not switch of diplay and contrast only the backlight:

    Code
    1. reg open \system\currentcontrolset\control\power\state\screenoff\{EB91C7C9-8BF6-4a2d-9AB8-69724EED97D1}
    2. reg set value Default dword 2
    3. reg save


    Hope this helps.

    F&S Elektronik Systeme GmbH
    As this is an international forum, please try to post in English.
    Da dies ein internationales Forum ist, bitten wir darum, Beiträge möglichst in Englisch zu verfassen.

    Hello,


    - The "contrastenable" is already set "0" .
    - What is the register for PSS driver, where is the key "flags" ?
    - I try your the following setting but this doesn't work


    reg open \system\currentcontrolset\control\power\state\screenoff\{EB91C7C9-8BF6-4a2d-9AB8-69724EED97D1}
    reg set value Default dword 2
    reg save



    - But by changing the register "DxOff" of the "FSPMScreenSaver" register (see below) to "0", it work !!!


    HKEY_LOCAL_MACHINE\Drivers\BuiltIn\FSPMScreenSaver]
    "Prefix"=" "
    "Index"=dword:00000001
    "Dll"="FSPMScreenSaver.dll"
    "Order"=dword:00000001
    "DxOn"=dword:00000000
    "DxOff"=dword:00000001
    "IClass"="{69602DFE-568F-47b2-B616-A3EF6D63766A}"


    Please explain me the key definition of DxOff ? Is the right way ?


    Best regards

    Hello,


    this "HKEY_LOCAL_MACHINE\Drivers\BuiltIn\FSPMScreenSaver" is the "PSS" key!
    Did you delete the prefix value???
    Set here "flags" to "4" for disable the Driver.


    Dx are the corresponding power states for switch LCD on/off (http://msdn.microsoft.com/en-us/library/jj919304.aspx).

    F&S Elektronik Systeme GmbH
    As this is an international forum, please try to post in English.
    Da dies ein internationales Forum ist, bitten wir darum, Beiträge möglichst in Englisch zu verfassen.

    Hello,


    Sorry i dosn't delete de prefix see below :


    [HKEY_LOCAL_MACHINE\Drivers\BuiltIn\FSPMScreenSaver]
    "DxOff"=dword:00000001
    "Prefix"="PSS"
    "Index"=dword:00000001
    "Dll"="FSPMScreenSaver.dll"
    "Order"=dword:00000001
    "DxOn"=dword:00000000
    "IClass"="{69602DFE-568F-47b2-B616-A3EF6D63766A}"
    "Flags"=dword:00000004


    I add "flags=4" (see red line above) and it works fine!


    Great support, thank you very much.