Question about Samsung SyncMaster 940N Flat panel Monitor

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Syncmaster 940n Blinks along with Blue Power Light on I/O Button every few Seconds

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  • Anonymous Mar 28, 2009

    This monitor is used on a visually impaired magnifier device and the power blinks and the monitor goes through an auto screen diagnosis every few minutes.

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6 Suggested Answers

tantong
  • 138 Answers

SOURCE: Samsung Syncmaster 940n - white screen

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

Starworx
  • 4 Answers

SOURCE: 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

Posted on Dec 17, 2009

  • 29 Answers

SOURCE: my samsung syncmaster 2232bw wont turn on at all,

Solution for Samsung SyncMaster 2232BWplus:

The problem is bad capacitors: 5 pcs. 820microFarad – 25v and 1 pc. 330microFarad -25v. Replace these capacitors. Then re-solder the two transformers of inverter side. Also re-solder the power transformer and the inductor coil.
To open the casing:
At the bottom of the stand just twist the knob to unlock. Then, use a small flat screw driver beginning from the bottom (left or right) then using a hard credit card (or alike) then slide/glide it in between the cover plastics.
Roan
Triangle Tech Whiz

Posted on Jan 07, 2010

  • 732 Answers

SOURCE: 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.

Posted on Jan 30, 2010

Testimonial: "12fixlouie has been most helpful in helping me find a solution to my monitor problem."

viziks
  • 220 Answers

SOURCE: Hi. I have a samsung syncmaster 940n black. After

This seems to be problem of Inverter / powerboard. If you are techically able to repair electronic equipments I can help. Needs soldering skills.
Samir

Posted on Feb 17, 2011

  • 1684 Answers

SOURCE: 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

Posted on Feb 26, 2012

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1 Answer

When I turn on computer,monitor doesn't show anything sometimes 1,2 hours , and then finally I can see descktop on computer...All that time,monitor is trying to show picture (I can see like blinki


This is a known symptom of a failure in the power supply board. Here is a link to a repair guide that shows how to dis-assemble and the unit and then what to look for and replace on the power supply board to bring the unit back to working condition.

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 that needs to repair.


2_26_2012_6_05_52_pm.jpg

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

BuddyMc

Feb 22, 2012 | Samsung SyncMaster 940N Flat panel Monitor

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

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

1 Answer

After startup on Sammsung SyncMaster 940 N I do not see


Sounds like system software needs to be replaced... re-installed. It probably got corrupted somehow since it is not rebooting properly. Use the original discs that came with the computer. Thnx

Jul 24, 2010 | Samsung SyncMaster 940N (Silver) 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 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

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

Screen goes blank after 2 seconds


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.

Jan 20, 2009 | Samsung SyncMaster 940N 19 inch LCD...

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