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Ronald Hart Posted on Oct 24, 2019
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I have a Samsung Syncmaster 920NW and the screen goes black after a few seconds of turning it on and the blue light does not blink but stays on.

I have searched everywhere and found the capacitors on the board might be the problem, which they did not seem faulty, and I replaced them all anyway. But it did not solve the problem. Please, is there anyone out there that can assist me in any way?

1 Answer

GreenHotrod Hotrod

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  • Expert 105 Answers
  • Posted on Oct 25, 2019
GreenHotrod Hotrod
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Its possible the panel is going out.

3 Related Answers

Anonymous

  • 2 Answers
  • Posted on Oct 27, 2009

SOURCE: Monitor goes blank after 3 seconds -Samsung SyncMaster 920NW

hello i have the same problem, there are 4 lamps (bulbs) inside the monitor when some of them falls the system turn off, cheks and good look

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budmrtn

Bud Martin

  • 11361 Answers
  • Posted on Sep 15, 2010

SOURCE: Samsung SyncMaster 920nw Comes on for about 5

Check the DC filter caps in the power supply-inverter section first.
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.

Buddy Mcsparrin

  • 1684 Answers
  • Posted on Jan 18, 2012

SOURCE: Samsung SyncMaster 920nw suddenly went black now squeaks/flickers

The 920nw did have a 3 year warranty on the unit but they will be out of warranty now. The flickering power light is an indication of a failure in the power supply board. When the board fails it can't start up correctly and the power shuts down over and over so you get the blinking light and no display. This is a very common failure point on all LCD monitors after a few years of use. There are parts called capacitors on the power supply board and they filter the output power. When they fail the power is not properly regulated and the power supply shuts down and tried to restart so you get the flashing. Here is a link to a repair guide that will show you how to dis-assemble the unit and then what to look for and replace to get it back up and running again.

http://www.ccl-la.com/blog/index.php/repairing-the-samsung-920n-920nw-monitors/

The repair guide has pictures and videos to guide you through the repair.
I hope this helps, if so please rate my solution.

BuddyMc

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Samsung SyncMaster 920nw shows 3 second display and the blue light stays on and does not blink,

I have the very same problem and I have no knowledge of the backlights of LCD panels. Is there any way to fix this yourself?
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When I turn on my computer the monitor turns on for about 3-5 seconds and then goes black. The blue light stays on and does not blink. If I turn the monitor off then back on it will again show the screen...

Had same problem, Monitor first turn on, backlight off after couple of minutes, off/on backlight off after few seconds.
Solution cut J503.
Found voltage OVPT (IC501,7) quite low (1.6V) this is the reference value for VSEN the over voltage value. By cutting J503, OVPT becomes 4.5 volt but is not depending anymore on the current through the lamps. Instead of the link J503 I solder 2x 1N4148 diodes which makes the OVPT not go below 2,8 volt. (diodes in series, cathode points to nearest board edge)
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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
1helpful
2answers

Samsung SyncMaster 920nw suddenly went black now squeaks/flickers

The 920nw did have a 3 year warranty on the unit but they will be out of warranty now. The flickering power light is an indication of a failure in the power supply board. When the board fails it can't start up correctly and the power shuts down over and over so you get the blinking light and no display. This is a very common failure point on all LCD monitors after a few years of use. There are parts called capacitors on the power supply board and they filter the output power. When they fail the power is not properly regulated and the power supply shuts down and tried to restart so you get the flashing. Here is a link to a repair guide that will show you how to dis-assemble the unit and then what to look for and replace to get it back up and running again.

http://www.ccl-la.com/blog/index.php/repairing-the-samsung-920n-920nw-monitors/

The repair guide has pictures and videos to guide you through the repair.
I hope this helps, if so please rate my solution.

BuddyMc
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My samsung syncmaster won't start. It stays black (the light on the power on button is green). If I try to power it off and on again, I can see my desktop for a few seconds then it beeps and die.

Hi:
You have a problem with the power supply that is built into the monitor. These are not easily repaired, as the cost exceeds the value of the monitor.
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Monitor goes blank after 3 seconds -Samsung SyncMaster 920NW

Could be a power issue. If it doesn't show anything at all then that may be the case. It may also be the display itself. It would be a costly repair so you might be better off finding a new monitor.
1helpful
1answer

I have a samsung 920nw monitor bought it new. It has worked great for months, this morning I went to turn it on and it only came on for a second then turned off. I have restarted the PC and the monitor...

Hello,

It sounds like you have a monitor with a common problem. After a few years some LCD monitors will blow a power supply. The problem is caused by parts called capacitors overheating in the confined space of the monitor. If you are good at electronics repair/soldering you can usually fix the problem. Check out a few pictures on my web site www.ccl-la.com/badcaps.htm You can take the back cover off your monitor and look for the bad parts,replace any that look like the pictures and your monitor should work fine. The capacitors do need to be installed with the correct + and - connections, note the stripe on the old one and insert the new one the same way. If you don't want to try the repair yourself we offer a repair service for $35 plus shipping.

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

Buddy
Corporate Computer
www.ccl-la.com
Over 21 years of computer and printer support/repair
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My samsung NW920 turns off after 1 min

If the blue LED ist blinking the monitor does not receive a video/sync signal. If the blue LED is on continuously and the display comes on for a few seconds and then goes dark or dim the backlight inverter may well be defective. The CCFL of the backlight needs several hundred volts to function.
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