Question about Samsung SyncMaster 940B 19" LCD Monitor

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SyncMaster 940B I have a problem with this monitor. It works on other another computer, but with mine it displays strange things. Cursor becomes a black square. Elements become black. Horizontal lines appear and disapper. Whole elements become dark. Finally it freezes and then turns off, with the blue power button flickering.

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  • Frank Zhang
    Frank Zhang May 11, 2010

    you mean the monitor works normal in other destop but yours trouble? whats your destop brand model? video card is onboard or a AGP card?

  • Drew
    Drew May 11, 2010

    Does this happen to other monitors attached to that computer, or does it happen with the SyncMaster, no matter which computer it's connected to?

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  • 91 Answers

Sounds like you have a video card problem. If it works on someone elses PC and not yours. Replacing this video card on your PC should fix it..

Posted on May 14, 2009

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My samsung 940b it has a clear bright screen ( as normal ) just for 2 seconds then the screen turns dark but you can see very very dim Window logo.Turn off the power ( does not matter for how long ) when...


Shine a flash light onto the monitor, if you can see icons/desktopon the screen then you know you need a new monitor!
You should be covered under warranty!

Mar 02, 2011 | Samsung SyncMaster 940B Monitor

1 Answer

The screen syncmaster 940b comes on momentarily and the fades out, if you turn the screen off then on it does the same thing.


Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses, poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

Jun 10, 2010 | Samsung SyncMaster 940BE 19" LCD Monitor

1 Answer

My monitor has its power light on and the com recognises it, but there's no image.How can I fix this?


press menu button increase brightness if no picture then there is a problem in monitor open it there is a fault in e.h.t. take screwdriver and rotate a preset attatched to e.h.t.which is a biggest black part of a monitor if no brightness on monitor then replace E.H.T

Feb 28, 2010 | Samsung SyncMaster 940B 19" LCD Monitor

1 Answer

Error message on Syncmaster- check signal cable


sounds like it might be a graphics card. if u have an old graphics or vidio card, open the case and remove your card then install the old one. if it works now youll know your card is bad. If u have an old video card and an open pci slot install it and move the monitor cable to the old video card plugin. if it works now same thing your graphics card is bad. to know which card to remove just remember which one the monitor is plugged into.

Jul 29, 2009 | Samsung SyncMaster 940B Monitor

1 Answer

Monitor just went blank, no power light.


Was the PC running, and then shut down? Or, did it never start in the first place?
It sounds like it could be one of many things. Sometimes if the processor fan has failed, the computer will start up, and then shut down. Also, bad memory can cause the PC to shut down.

Jul 05, 2009 | Samsung SyncMaster 940B 19" LCD Monitor

1 Answer

Screen goes black and have to restart


looks like you have a DRY SOLDER or COLD solder , if your handy with tools , you have to open monitor and check the PC BOARD, specially where some transformer is located look around that area for some burnt spot , re solder it , and try it again , should be working properly , hope this helps AJ

May 02, 2008 | Samsung SyncMaster 940BE 19" LCD Monitor

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