I have samsung sync master 920nw monitor . this monitor turn on after few minutes disply is going turn off ,but power butten LED working...I romove the PCB and changing All capacitor but no use ..same

SOURCE: samsung sync master 510 monitor display problem

It may be that the LCD monitor will not display all screen resolutions so you may need to change your resolution to match the desired resolution and refresh rate of the LCD. In your case the computer should be outputting:

1024x768 pixels
60 Hz

You can change these settings by right clicking on the desktop and clicking properties and they're under the settings tab. Change the screen resolution by moving the slider to the recommended setting (1024x768)

and

under the advanced button click the "monitor" tab - make sure the screen refresh rate is set to 60 hertz (60 hz)

SOURCE: Samsung Sync Master 943bw monitor shuts down after

Mine shut down during my normal working day. Same thing, turn it off and on again - screen flashes up briefly then flicks off again.
Called Samsung and they are replacing it with a refurbished screen under warranty.

SOURCE: Start up problem with Samsung Sync Master 731BF 17" monitor

Hello,

Your internal power supply is failing. There are parts called capacitors that are not functioning correctly and this causes the power supply to not be able too stabilize the voltages that run the monitor. After repeated power cycles the capacitors will hold enough charge to function until you urn the unit off and then they discharge so you have to start all over again. We have a step by step repair guide article posted at: http://www.ccl-la.com/blog/index.php/samsung-204b-lcd-monitor-repair/ This should get you back going again. If you don't want to do the repair yourself we do offer a repair service, you can get that information here: http://www.ccl-la.com/blog/index.php/service-request-form/

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

Buddy
Corporate Computer
www.ccl-la.com

Bud Martin

• 11361 Answers
• Posted on Jun 04, 2010

SOURCE: Samsung 920nw Turns on, warms up then goes off.

Yes, it can be bad lamp assemblies (see my bad backlight album) due to poor soldering works or just worn out. You need a set of spare lamp assemblies to find out if it is the lamps or the inverter circuits, the inverter goes into shutdown mode if there are short circuits, or the lamps are drawing too much current, or the lamps do not conduct after firing voltage is applied to the lamps. You can also have open/shorts winding of the inverter transformers. One thing about the caps are that they can look OK but have high ESR. One experiment you can do is to heat up the caps using hair dryer for about 3~4 minutes then plug the monitor to the outlet and see if the lamps will stay on.
Here is the service manuals, at least you can take some voltage measurements.
http://elektrotanya.com/?q=showresult&megnev=samsung&megnev2=920nw&kategoria=&kat2=all

http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

Testimonial: "Though and I'm looking into your suggestions, thank you!"

Bud Martin

• 11361 Answers
• Posted on Sep 23, 2010

SOURCE: samsung gh19ws (920nw) model lcd

Common problem is in the DC filter caps in the power supply circuits, that will be the first thing to look for first, please note that bad cap can look normal but can have high ESR.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), 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 SAMSUNG 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
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.