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Samsung 940N , picture OK, backlight goes of after 1-2 seconds. Opened the monitor ,all capacitors seem to be OK, (no blowouts). This part (AP4525GEH) - N AND P-CHANNEL ENHANCEMENT MODE POWER MOSFET , seemd to neated the board on the other side since the board is darkened(not a lot).Found it on www.alldatasheet.com , measured it and seems to be ok. Surfing the web for a the problem found ot a "solution" for this "2second" backlight problem and they said if you have this "2 second" backlight issue then this is the problem. Any suggestion from you??? I wrote you becouse of your high rank on FIXYA. I would appriciate a lot for a quick answer, THANKS.

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  • marionbagget Mar 13, 2011

    This part cost about $3-$4 so the price is not high It could be failing after it heats up in a few seconds. You can check the input voltage to it and output. Or go and replace it.

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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

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

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

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

1 Answer

Moniter lites up for about 1 sec, then goes out.


Hello

Sometimes you can get a good incation because the tops have domed over. However, the best method is to take each out of circuit and test with an ESR meter. Even though it's unlikely, other components can cause this same symptom. For more info see my website: www.micromendllc.com

Good Luck

Sep 23, 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

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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