Main display goes black when I connect VGA secondary monitor

Page 1 of 2 12 LastLast

  1. rlx
    Posts : 8
    windows7 ultimate 32bits
       #1

    Main display goes black when I connect VGA secondary monitor


    Hi,

    The main screen of my tablet PC goes black as soon as I plug-in the VGA cable to a second monitor. I guess this is the result of me selecting an incorrect display mode for the monitor. The secondary monitor (A Samsung 1920x1200) complains of the video signal mode and does not display anything other than an error window.

    The dual display mode worked fine before I made that mistake. I guess the resolution used for the secondary monitor is now incorrect. I would need to reset that value with the secondary monitor disconnected. That's what I am looking for.

    Now when the VGA cable is disconnected, I get back the screen. I have looked at all display controls and the 945gm controls, but I had no luck restoring the secondary monitor settings.

    I have tried booting Windows7 with the secondary monitor connected. I get both the main display and the monitor working in mirror mode when in BIOS mode, but I loose both as soon as windows7 is activated.

    I would need some means to have windows7 reset the whole display subsystem.

    Does anyone knows how to solve this issue.

    Thanks for any clue.

    Richard

    PC is Motion LE1700, L7400 dual processor, 1440x1050
    Secondary monitor is Samsung 1920x1200
      My Computer


  2. Posts : 2,039
    Several, including Windows 7 x64 Ultimate
       #2

    I assume from your display resolution that you have a Samsung T260 ?

    You can get the correct driver for it here;


    http://www.samsung.com/ca/support/de..._mdl_name=T260

    Quite a few machines require that you switch them over to an external display. How this works ,varies from machine to machine.

    You may also need to click on the desktop, "Screen Resolution", and choose "Extend these displays";




    Regards....Mike Connor
      My Computer


  3. rlx
    Posts : 8
    windows7 ultimate 32bits
    Thread Starter
       #3

    Mike, thanks for the infos.

    Mike Connor said:
    I assume from your display resolution that you have a Samsung T260 ?
    It is the SM245t

    You may also need to click on the desktop, "Screen Resolution", and choose "Extend these displays";

    Regards....Mike Connor
    This is the problem I have: I can't get there because my main display becomes black as soon as plug-in the VGA connector...
      My Computer


  4. Posts : 2,039
    Several, including Windows 7 x64 Ultimate
       #4

    That driver installs automatically with windows;

    Windows 7 Compatibility for Samsung 245T 24" LCD: Samsung. Drivers, Updates, Downloads

    But to be sure I would re-install it if I were you. I would also prefer the manufacturer's site for getting the driver;

    The Samsung site is playing up as usual, but you can get the driver here;

    http://download.driverguide.com/driv.../d1742457.html

    If you unplug the external display, can you get to "Screen Resolution" on the desktop then?

    Regards....Mike Connor
      My Computer


  5. Posts : 2,039
    Several, including Windows 7 x64 Ultimate
       #5

    PS. Some of the Samsung monitors need to be manually switched over to analogue (VGA) display characteristics. This is usually a button on the side of the display.

    Regards....Mike Connor
      My Computer


  6. rlx
    Posts : 8
    windows7 ultimate 32bits
    Thread Starter
       #6

    Sorry, this is the 275t. I went on Samsung site to have alook at the manual and I saw a driver for older versions of Windows only. I am quite sure I get the latest Windows7 driver through Windows Update. I'll double check anyway.

    Mike Connor said:

    If you unplug the external display, can you get to "Screen Resolution" on the desktop then?

    Regards....Mike Connor
    I get to "Screen Resolution" for the main screen only. Controls for the external monitor are greyed out.
    Attached Thumbnails Attached Thumbnails Main display goes black when I connect VGA secondary monitor-display1.jpg  
      My Computer


  7. Posts : 2,039
    Several, including Windows 7 x64 Ultimate
       #7

    Check in "Advanced settings", that screen refresh rate is correct for your monitor. Make sure you check the box "Hide modes that this monitor cannot display". If you clear this box, and select a mode the monitor cannot use, then you may damage it!!



    Regards....Mike Connor
      My Computer


  8. Posts : 2,039
    Several, including Windows 7 x64 Ultimate
       #8

    Also open "Properties" in "Advanced settings", and if necessary uninstall the driver.



    When the device is then plugged in again, Windows should detect it and ask for a driver.

    Regards....Mike Connor
      My Computer


  9. rlx
    Posts : 8
    windows7 ultimate 32bits
    Thread Starter
       #9

    Hi Mike,

    I installed the latest driver for the SM275TPlus from the Samsung web site, but the behavior has not changed. The tablet screen becomes black as soon as I plug-in the VGA connector.

    I then uninstalled the Samsung monitor driver. I get the same behavior (a black screen) except that Windows now use the" Generic PNP driver" without asking.

    I feel that something deeper in the Windows parameters needs to be reset with regedit. I don't know what.
      My Computer


  10. rlx
    Posts : 8
    windows7 ultimate 32bits
    Thread Starter
       #10

    At last, this problem is resolved. It was just a matter of turning the tablet off and on (not just a reboot) and then "mirror displays" worked again :). This is a frustrating experience for everyone...

    Thanks Mike for your patience.
    Last edited by rlx; 17 Apr 2011 at 16:59.
      My Computer


 
Page 1 of 2 12 LastLast

  Related Discussions
Our Sites
Site Links
About Us
Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

© Designer Media Ltd
All times are GMT -5. The time now is 01:12.
Find Us