Question about Samsung SyncMaster 740N 17" LCD Monitor

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N0 or Very little backlight on Samsung SyncMaster740 17" Monitor

When you press power botton on monitor, power light comes on and remain on but the backlight go's off after two seconds

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  • Nerijus Mazuolis May 11, 2010

    its the microchips NT68F63L problem on vga board or bad capacitors. you need to open
    monitor to solve the problem. there are more than 3 ways how to repair.
    Can you open the monitor ??

    or

    if you want there is manual how to repair samsung monitors with this
    problem you can find on ebay: Repair manual Samsung monitor 710n, 913v,
    510n and more, Item number: 220389041052.

    it shows step by step reparation process.

×

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  • 17 Answers

Back light is going bad. if you see a pinkish hue on the" checking signal" box on screen when it comes on. Should be white.

Posted on Jul 30, 2010

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Most common failures in these LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply C242 470uF 10V, C241 & C242 1000uF 16V, C261 & C319 680uF 35V failed as indicated in the attached picture, replace them at once.

If the power supply board is working then it is back light problem, first do a flash light test. If you can see the image in the flash light test, follow the steps how to test back light voltages: https://how-to-repair.org/repair/lg-tv-repair-manual-pdf/lg-led-tv-no-backlights-32ln5300-32ln5310-32ln5700-voltage-test-troub/2pyuXwNkBMA.html and follow the steps how to repair back light LEDs: https://www.youtube.com/watch?v=_poWTEihIJU Fix Led Backlights for TV or Monitor Lg Led Tv No Backlights 32ln5300 32ln5310 32ln5700 Voltage Test Troub Lg... Fix Led Backlights for TV or Monitor
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My Dell 1905fp Ultrasharp was coming on intermittently for a little bit and then it would not power up at all.


You said your monitor will be on for little bit and then would not power up anymore... there are two possible reasons why this problem occur..

1. You need to check if the high voltage ballast transformer of your backlight inverter is about to be burned... the transformer is overheating..that's why you experience the monitor working for a couple of minutes and then it will shut off until the transformer cool down again and then it will be ready to work again...

2. You need to check the power supply section for possible loose connections and blown capacitors.. the ballast transformer has direct effect on power supply section.. when there is overheating transformer,,, the supply current from the power supply section becomes unstable.. and will not be able to supply the remaining good working ballast transformer.

In case you do not know, the ballast transformer generates high voltage for the backlight inverter to work..The backlight inverter is the light source that is responsible for the image display of your screen...If the ballast transformer is not working or if the backlight is busted then the only thing that you will see in your screen is black....

Please be advise that if you don't have the knowledge, the proper skills and the right tools to open the back cover of your monitor and replace its part...don't risk it...

Otherwise, bring your unit to a credible technician and avail of warranty if there is any.....


Much appreciated if you rate this help...thanks...

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Hello,

This is a typical symptom of a failure of the capacitors on the power supply board. When the filter capacitors go bad the power supply can not start up correctly so you get flickering or even no display. You can repair this unit by replacing the bad capacitors and a fuse on the power supply. This is an easy repair, it just requires a little soldering. Here is a lin to additional information on which capacitors need to be replace and also here is a picture of the power supply board with the capacitors and fuse circled.
http://www.ccl-la.com/catalog/product_info.php?products_id=229

9_7_2012_3_30_57_am.jpg

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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.

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Please rate me.

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