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Samsung 2233RZ going black after 1-2sec

Starts the screen and it shows the background image for 1 to 2 seconds then the picture becomes black. Start it again and it does the same thing again. I have opened the screen but do not see any capacitors that are clearly broken. Could it be the mainboard? Or should I replace all capacitors on the psu anyway?

Posted by jays112 on

  • jays112
    jays112 Dec 22, 2012

    Forgot to say that the power light remains on when the image is black

  • jays112
    jays112 Dec 22, 2012

    And now i have confirm that it is the backlighting. Any ideas how to fix that?

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1 Answer

Sudeep Chatterjee

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  • 3,267 Answers

First if you can, try the monitor with other PC first to make sure it is not the PC problem.

If it behaves in the same fashion, then most probably has dying power supply due to bad DC filter caps, just see the top side of the caps to ensure it has not bulged up distorted.See the images bellow
Samsung 2233RZ going black after 1-2sec - 12_24_2012_5_33_15_pm.jpg OR


12_24_2012_5_34_01_pm.jpg

Then there is the logic board. Plug the monitor in but do not activate the power switch so the backlight inverter circuits will be off. Check the 5vdc and the 12~24vdc to make sure they are OK. They should be tested with the load, you can use 6V 1A (6watts) lamp for the 5vdc, and car lamps such as 1157 (12v 8watts lo/26watts high) turn signal brake lamp using high filament connection for testing the 12~18vdc (or use two 1157 in series for 19~24vdc) for the backlight inverter circuits.
If the power supplies are working, the output voltages should be steady at the rated voltages. The power supply will go into shut down if it detects too much current draw due to false in the power supply or short circuits in the backlight inverter or in the logic board.

The backlight inverter circuits:
It takes the 12~24vdc and converts it to high frequency AC to drive the inverter transformers CCFL (Cold Cathode Fluorescent Lamp) assemblies. The transformers will drive the CCFL by applying the start up voltage (around 1500~2000v), when the CCFL start conducting, the voltage will drop down to about 500~800v.
The inverter has detection circuits to detect open circuit if the lamp is not attached or does not fire up after the start up voltage is applied, it will go into shut down. It will also shut down if the lamps draw too much current due to ages (when lamp gets old it will draw more current).
The inverter gets two signals from the logic board, one is the backlight ON/OFF signal, the other one is the Dimming signal for the lamps.
Common problems:
Bad filter caps, resonant caps (in the inverter output circuits), blown transistors/IC, shorted or open transformer winding.

If you are confident with your skill then go ahead else go to an authorized outlet for repairing
Do write back if you face any difficulty while working on the monitor

Posted on Dec 24, 2012

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2 Related Answers

Anonymous

  • 10 Answers

SOURCE: MAG Innovision LT2219WDB monitor will turn on

I have the same problem with a customer's monitor (LT716S); it turned out to be damaged power supply board. As I understand it, MAG has a 3 year warranty on parts, will probably charge you a flat labor fee plus shipping. If you do not have your purchase documentation for warranty, dump it and replace. If you can, then you may wish to have it repaired.

My customer replaced theirs; I am trying to purchase replacement parts to repair...good luck.

Posted on Feb 25, 2009

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Buddy Mcsparrin

  • 1684 Answers

SOURCE: Samsung monitor picture clicks off after 2-5 seconds...

Yes, It sounds like the backlight inverter circuit is shutting down. No inverter power, no backlight. On some monitors the inverter circuit will shot circuit the power power supply which makes the power light flash on some it just kills the backlight. You can usually check with a flashlight. Hold the flashlight pointed at the screen and see if you can see any of the icons or background picture. If you can then it is the backlight circuit or backlight tubes, usually the circuit.

Buddy


Posted on Jul 24, 2009

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