Question about HP L1940T 19" LCD Monitor

2 Answers


I Have a monitor HP L1940 TFT and if I switch this monitor on without a
line connection to the computer the monitor gives a good message that
there is no line connection !
If I conect the monitor to the computer the monitor displays an intermittent
picture goes on and off(This computer is tested with an other monitor and than it works oke)
If I keep the AUTO pushbutton pressed and held it on pressed the monitor
works oke and the picture is stable
As soon as I release the Auto Pb the monitor start flashing again
Do You have any Idee what can cause this trouble!

Many thanks in advance

Gerard Nieuwenhuijs

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  • 3 more comments 
  • Anonymous Feb 01, 2009

    mine too except nothing happens when i push the auto button

  • Anonymous Feb 07, 2009

    1 sec picture after any push button, then dark.
    what's this`?

  • atoemchen Feb 07, 2009

    same problem: picture, for 1 sec, then dark. repeatable after off-on or auto button pushed.

  • mulberry28 Feb 20, 2009

    I have an HP 1940 monitor. when I start the computer the screen comes on briefly, a white box flashes in the middle of the screen, and then the monitor goes black. I brought it to a local repair place who told me the bulb inside has the bulb repairable or should i toss the moniotr and buy a new one any help on this would be grea thanks

  • mulberry28 May 11, 2010

    how do i fix that?


2 Answers

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  • 1 Answer

I jammed my auto button and the screen now stays on!

Posted on Jun 23, 2012

Your input selector switch is broken.

Thomas, Denmark

Posted on Sep 08, 2008

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1 Answer

I manage a building, located in a suburb of Houston TX. We have had several HP 1940 monitors overheat and start smoking (about 10-15) over the last couple of years. The company who provides IT service,...

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Try the following steps:
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  2. If the monitor has more than one type of connection available such as VGA, DVI, or HDMI, try a different type of connection.
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It's possible that the ACPI (Advanced Configuration and Power Management Interface) is not enabled in the bios. To access the bios either press F2 or DEL, depending on the motherboard(usually tells you on the initial boot screen), then look for a line that reads 'Power Management Setup' or similair and press ENTER. When into the menu check to see if ACPI is reading enabled, if not press the right arrow on your keyboard then either press PAGE UP or PAGE DOWN or + or - on the keyboard. Press 'ESC' then it will ask if you if you want to save changes, press'Y'. That should sort it.

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