Question about Samsung SyncMaster 204B 20.1" LCD Monitor

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Monitor will not come on.

Power light keeps blinking. sometime it take hours to work.

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Look at the caps in the power supply section first, look for leaking/bulging top caps.
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses, 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
http://www.badcaps.net

Posted on Jun 01, 2010

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Posted on Jan 02, 2017

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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

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Monitor black but power light blink green


The 470uF 25 Volts capacitors on the power supply board are probably bad. Replace them all and tell us the result !

Feb 24, 2010 | Hannstar I-Inc TW-191D Monitor

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I have a monitor HANNS-G It worked 3 years. And exactly after 3 years warrant policy ended my monitor got a problem. It looks like there is a problem in power connection on front buttons. After I connect a...


This is a problem with the power supply unit inside the monitor, there is no easy way out here. If you keep on using your monitor like this eventually it won't switch on no matter how long you wait. Keep on using it like this for the time being without switching off anything but ultimately you will have to take it in for repairs or otherwise purchase a new screen..

Aug 02, 2009 | Microsoft HannsG HU171D 17" LCD Monitor

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There is no display on the monitor screen. The amber light on the power switch keeps blinking uselessly!


The monitor requires service The monitor is not receiving a signal from the computer

Apr 15, 2009 | Computers & Internet

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LG 700E monitor's power LED blinking continueously, no display


The monitor is probably on protection.

To start unplug monitor from power and from computer and test computer with different monitor to find out if it is monitor or computer fault.

If it is computer fault and no video signal , then test:

  • Video cable.
  • Video adapter on PC (sometimes integrated on motherboard)
  • Motherboard.

If it is monitor fault , then the monitor is on protection.

When on protection you keep having a flashing led on front of the monitor , and monitor turning off by itself after a while, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the Monitor goes on protection there are only two possible causes.

1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or a broken contact, identified an internal fault and kicked in , starting the flashing light.


If you are in situation one, then the monitor will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occurr are a blown capacitor on power board, faulty inverter board, faulty input board, or a fault on LCD Digital Controller board.

Check also the video cable or any external connection cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.

Try moving the video cable, and if the cable is not built in, then also try a replacement cable.

If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

Apr 08, 2009 | LG 500LC Monitor

1 Answer

Monitor power light is blinking and cannot see anything.


The monitor is probably on protection.

To start unplug monitor from power and from computer and test computer with different monitor to find out if it is monitor or computer fault.

If it is computer fault and no video signal , then test:

  • Video cable.
  • Video adapter on PC (sometimes integrated on motherboard)
  • Motherboard.

If it is monitor fault , then the monitor is on protection.

When on protection you keep having a flashing led on front of the monitor , and monitor turning off by itself after a while, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the Monitor goes on protection there are only two possible causes.

1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or a broken contact, identified an internal fault and kicked in , starting the flashing light.


If you are in situation one, then the monitor will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occurr are a blown capacitor on power board, faulty inverter board, faulty input board, or a fault on LCD Digital Controller board.

Check also the video cable or any external connection cable, if the cable is shorting, or the connector is bad, you can get same flashing statebecause of the video cable.

Try moving the video cable, and if the cable is not built in, then also try a replacement cable.

If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

Dec 16, 2008 | TDV Vison TDV FV19B 19" Flat Panel LCD...

1 Answer

Monitor keeps blank even the power lLED is on green


Try replacin a new display card. If it is fine working.ok
If not try fixing for cold solder in the video section.
I suggest video section according your report the light green LED lighted that shows the power section is doing fine.

Apr 22, 2008 | Proview PL913S 19" Flat Panel LCD Monitor

1 Answer

Monitor keeps blank even the power lLED is on green


If it's working fine in DOS, it can only be your display drivers for your operating system. What happes when you start in SAFE MODE? When you PC starts, keep pressing the F8 key, go to Safe Mode. If it works, bring the Resolution down to 800 X 600 and load the new display card drivers. Restart, should be fine.

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