Question about Samsung SyncMaster 940N Flat panel Monitor

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Samsung Syncmaster 940n - white screen

I have a Samsung Syncmaster 940n for less than a year, all of a sudden the monitor just went blank (white) - thought shutting it down may help but next morning same thing as soon as booted up white no imgae what so ever, could this be a driver problem?

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This is a known symptom of a failed power supply board. Here is a repair guide for this unit that shows how to dis-assemble the unit and then what to look for and replace to rebuilt the power supply board and bring the monitor back to life.

http://www.ccl-la.com/blog/index.php/repairing-a-samsung-940n-with-a-blinking-power-light/

And here is a picture of the power supply board.



Samsung Syncmaster 940n - white screen - 2_26_2012_6_01_47_pm.jpg

I hope this helps you, if so please rate my solution.

BuddyMc

Posted on Feb 26, 2012

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Didn't you read the man said blank white screen not BLACK screen.

Posted on Sep 02, 2008

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I don't think the driver is a problem. This is the way how to examine what's wrong with your LCD monitors. After you turned it on and the screen went black, you have to check that if you can see the image on the screen or not by shining a flashlight into the screen, not directly but find the best angle to the screen and take a look very closely. If you can see the icons or any image, there will be a minor problem. This is because of the lamps inside screen. Some of them were broken and it is very easy to replace. If you cannot see anything on the screen, there'll be some problems with inverter board. If you have soldering tool and want to fix it by yourself, check the caps first. It may cause this problem. Some caps might show leaking or burn spot on the board because of too high temp. If you don't have soldering tool, you better go get a technician to do so. Hope this help!! If anything I can help you with, feel free to let me know.
Thank you,

Posted on Mar 26, 2008

I have the same problem with my SM 931C. The display remains white even when i disconnect all DVI and Analog inputs - just filicker to black. It flickers to black 1-2 times also when i change Sourse modes (Digital/Analog) from the screen buttons but the display returns white. The message windows (Digital Source / Analog Source) and screen menu don't appear at all. I can only change its state to full black by disconnecting the power cable :)) but when I reconnect it goes white again.

Posted on Sep 29, 2008

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2 Answers

Hi. I have a samsung syncmaster 940n black. After i turn on my computer the screen if just black and the blue light(where i turn the monitor on) just blinks.It worked normally yesterday.


The most common problem with the 940N units is a failure of the power supply/back light inverter board. This is easy to repair be replacing 6 capacitors on the power supply. Here is a link to a repair guide with dis-assembly instructions and what to look for and replace and the power board.
http://www.ccl-la.com/blog/index.php/repairing-a-samsung-940n-with-a-blinking-power-light/
And here is the power supply board.



2_26_2012_5_57_53_pm.jpg


I hope this helps, if so please rate my solution.

BuddyMc

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Blank screen the screen has been working for over a year and all of a sudden went blank its not my pc as i plugged my pc into another screen and worked fine.... the standby flashing stops flashing when i...


Since you have tried another monitor with your computer, then we can only assume that your LCD monitor had gone bad.
If the light is green but you can't see anything on the screen, then most likely the backlight has gone bad. Unless you want to take the monitor apart, I would suggest buying a new monitor.

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Your problem is usually caused by a bad power supply. You should be able to do the repair yourself, if just requires replacing 6 capacitors on the power supply board. Here is a link to a repair guide that shows how to disassemble the monitor and repair the power supply board.

http://www.ccl-la.com/blog/index.php/repairing-a-samsung-940n-with-a-blinking-power-light/

And here is the a picture of the power supply board.



2_26_2012_5_52_16_pm.jpg

I hope this helps, if so please rate my solution.

BuddyMc

Apr 16, 2010 | Samsung SyncMaster 940N Flat panel Monitor

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Stand for the monitor on a samsung syncMaster 940n broken


It depends bad the parts are broken, this is 2007 model, you may have hard time getting replacement parts, details pictures will help.
http://s807.photobucket.com/home/budm/allalbums

Mar 29, 2010 | Samsung SyncMaster 940N Flat panel Monitor

1 Answer

My samsung 940N acts like a florescent tube, tries to start and doesn't


Use the self test feature.. follow the steps..

1. Turn off both your computer and the monitor.
2. Unplug the video cable from the back of the computer.
3. Turn on the monitor.
If the monitor is functioning properly, you will see a box in the illustration below.
This box appears during normal operation if the video cable becomes disconnected or
damaged.
4. Turn off your monitor and reconnect the video cable; then turn on both your computer and the
monitor.
If your monitor screen remains blank after using the previous procedure, check your video
controller and computer system; your monitor is functioning properly.

Warning

The Power supply inside the monitor can be hazardous and donot open the monitor while power on.

Donot work with the monitor when it is open and the power supply is on.

If there is something wrong with the input signal, a message appears on the screen or the
screen goes blank although the power indicator LED is still on. The message may indicate
that the monitor is out of scan range or that you need to check the signal cable.

Feb 13, 2010 | Samsung SyncMaster 940N 19 inch LCD...

1 Answer

The monitor was working fine,but for one night the system was not shut down and when i cancel it then it shows only black.Samsung N940


theo_christo, Get into my FIXYA profile and see if anything interests you or your BLACK or BLACK/BLANK screen symptom. Learn about the "flashlight" test that every "CCFL backlit lcd" monitor owner should know how to do and interpret the results of. 12fixlouie READ, READ, READ!

Feb 01, 2010 | Samsung SyncMaster 940N Flat panel Monitor

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My samsung syncmaster 940n is no longer working, the blue light is on but the monitor is blank. Is there anything i can do?


This problem is usually caused by a failure of the power supply board controlling the back lights. Here is a link to a repair guide with disassembly and repair instructions that should help you get the monitor back up and running again.

http://www.ccl-la.com/blog/index.php/repairing-a-samsung-940n-with-a-blinking-power-light/


2_26_2012_5_47_09_pm.jpg

I hope this helps, if so please rate my solution.

BuddyMc

Oct 07, 2009 | Samsung SyncMaster 940N Flat panel Monitor

2 Answers

My monitor 940n samsung syncmaster gone in black...


I have just had this same problem. The problem mostlikely is a blown fuse on the inverter board. Mine was blown on the board and also a Capacitor (470nF/25V) was bad beside the Fuse.

I replaced both and monitor is working now again. After install the picture was a little grainy with little artifacts. In another post i found that the Power Supply board needs to be cleaned for unwanted residue. After that picture was fine again.

BEWARE that you need a soldering iron and a steady hand to replace these parts. If you are unfamiliar with soldering at all have an expert take a look at this. The Power boards uses 220v so DO NOT connect it to the Power when opened.

Starworx

9e48e23.jpg

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press the blue fn button and look for a screen on the buttons F1 through F12

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Do you have the video set to a range that this display cannot handle? Try rebooting into Safe Mode and set the resolution down to 800x600 or 1024x768 and see if it that will get you back. If so, then look up the specs of the display and set it no higher than it's max.

If it physicaly powers OFF, then you probably have a power issue.

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