Question about Samsung SyncMaster 940N (Silver) LCD Monitor

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Samsung 940n switches on only blue powerlight ,no visual picture only black screen

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Shine a flashlight onto the screen. If you see what you expect to be ont he screen as a shadow, that is a good indication that the "backlight" is not functioning. There can be many causes of this. Perhaps the most common is a failure of the driver transistor for the backlight itself. You can also cleck the power supply area for defective capacitors if you have the equipment. A visual check for bulged parts (a cap should be flat on the top), can also reveal defective part.

Dan

Posted on Nov 16, 2009

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This may be a failure of SMPS or backlite or main board.

Posted on Nov 16, 2009

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Powerlight red flashing 2 times


Over-voltage detection. Voltage comes out from the main regulator board will either be lower or higher than normal. Check it. To get some information, http://electronicshelponline.blogspot.com/Pull up older posts.

Dec 02, 2013 | Samsung Televison & Video

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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

Feb 17, 2011 | Samsung SyncMaster 940N 19 inch LCD...

2 Answers

SyncMaster 940N - screen has gone dark when turned on and computer booted up. If I get close to the screen I can just about see something on the screen. I have brought up the service menu and all the...


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

1 Answer

Samsung SyncMaster 940n monitor that turns on then goes black


rcpips, You may need to replace one or possibly 5 -8 aluminum can "electrolytic filter capacitors" on the "switch-mode-power-supply/CCFL inverter board. If, as you say "works for 5 or 6 seconds" then that means that fuse is good. Another thing you will need to inspect SMPS board for is "cold" "frosty looking" solder joints where the components (surface mount or through hole) are soldered to the copper circuit traces. May need large magnifying glass or low power inspection microscope to locate them. Resolder any that look bad or loose. Some solder joints have thinner than "hair" thermal fractures that can also cause YOUR TYPE OF SYMPTOM!! PARTS: digikey. mouser. newark. and possibly Radio Shack. If buying filter capacitors, make sure they are rated 105 deg C only!! NOT 85 deg C!!! If caps need to be replaced (swollen, leaky) be sure to tell us the brand name you find installed on your unit! CAPXON, ELITE, JUN-FU are just 3 that you don"t want to find in your unit. BAD news if you do!! If DIY suits you, remember to document with "close-up" digital stills your unit tear-down, so you can reassemble unit without any "extra" parts laying on kitchen table!! Filter capacitors are polarized. You put them in + to +, - to -!!! if you put them in backwards they go BOOOOMMM!!! Hope this helps a little. lmistyrel on aim or 12fixlouie at fixya.

Jan 30, 2010 | 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

Aug 10, 2009 | Samsung SyncMaster 940N Flat panel Monitor

1 Answer

Samsung syncmaster 913c


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

Jun 17, 2009 | Samsung SyncMaster 940N Flat panel Monitor

1 Answer

Black screen after a couple of seconds


The monitor needs to be replaced. I had an LG LCD that did this luckily it was still under warranty. Contact the maker and have your receipt handy. Otherwise buy a new monitor. Monitors tend to be replacement only

Apr 11, 2009 | Gateway FPD1960 19" Flat Panel LCD Monitor

2 Answers

Screen goes black after 2 seconds


Simplest solution may be the screen resolution settings are set higher than the monitor's capabilities. Try lowering the screen resolution and refresh rate in the display properties or try booting to safe mode (press F8 when the Windows splash screen first appears) and see if the LCD will display the windows desktop. It that works, check your video drivers and the screen resolution and refresh rate settings.
If the monitor has the problem in safe mode and/or if lowering the screen resolution and refresh rate don't help then I suspect the a problem similar to one some Dell 17inch LCDs have. On the Dells It is usually caused by a defective voltage regulator transistor in the backlight inverter circuit. Troubleshooting that problem should only be attempted if you have experience at repairing electronic circuitry since it will involve testing individual components and soldering.

Jun 15, 2008 | Samsung SyncMaster 940N Flat panel Monitor

4 Answers

Samsung Syncmaster 940n - white screen


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.



2_26_2012_6_01_47_pm.jpg

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

BuddyMc

Mar 25, 2008 | Samsung SyncMaster 940N Flat panel Monitor

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