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

Its possible the panel is going out.

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)

Yes, More than likely the problem with the unit is blown capacitors on the power supply board, the flashing power light is a good indicator of this type of failure. Here is a link to a repair guide with pictures and videos showing how to open the unit and what to look for and replace to get it back going again.

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

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

BuddyMc

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

Samsung syncmaster 920nw 19 goes black after 2 seconds

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.

This is due to backlite problem of LCD panel.
You may approach authorised service center for this issue they will solve your problem. Do not try to do yourself unless you have sufficient experience on LCDS.

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.