Question about AOC LM729 17" LCD Monitor

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Monitor problem Monitor powers on and displays an image for 10-20 seconds then screen goes black but power light stays on.

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Re: Monitor problem

You are experiencing an inverter board failure. You will need to replace or repair the inverter. The inverter drives the CCFL lamps that illuminate the screen if the lamps draw to much current or components on the board are overheating it will shut down the backlights. Some monitors have cold solder joints on the toroidal coils of the inverter that causes this problem, very typical with HP monitors, If you are handy with a solder iron you may try just re-soldering board and replacing push-pull transistors for a few more years of use. Provide make and model and I can be more specific about probable cause and solution.

Posted on Jan 18, 2008

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Re: Monitor problem

Its looks Bad CCFL lamps or a faulty TL1451 smd IC when power shutdown in 2 to 5 5 sec.
Imran khan

Posted on Jan 20, 2012

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If it was the power supply, the light would change to amber (orange) and then turn green again when it comes back on. Look closely at the screen when the it looks to turn off. See if you can still see an image. It may be hard to see, but when the backlights go bad or fail, the actual lcd screen itself still functions and you can see a very faint image. Maybe moving the mouse in circles might help you to be ablt to see. If you cant see anything at all, then it may be a bad board inside the unit.
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Solution 2, your cable is loose on the back of the monitor. Make sure you have the screws tightened on either side of the vga or dvi cable, both on the back of your monitor and on the back of your computer or laptop.

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Hi, I don't think the problem is with your monitor. Your monitor sounds like it's doing exactly what it's supposed to do. The monitor is supposed to turn off if there's no cable attached, which means there's no signal input. When the screen goes black, does the power light stay on and turn orange? or does it go off as well? I would recommend that you lower your screen resolution to 1280x1024 or lower in the Display Properties window, then remove your primary monitor, and connect the monitor to your desktop computer. You should see it light up when connected. The monitor auto-senses when there's a computer attached to the cable and when there's a signal. If it doesn't see a signal, it goes black to save power.

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2 Answers

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Monitor going black after a few seconds can be caused by a faulty power supply or inverter. Some monitors have both as one unit.
Sometimes it is basic failed capacitors, After that then I would look at transistors.
The average monitor from 17 to 20 and sometimes the 22s have usually 4 bulbs in them. One bad bulb will also cause the inverter to not fire up.
Bad bulbs usually show pinkish tint, or flickering or are dark at center top or bottom of the display.
ebays bammbammfran

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