Question about AOC LM729 17" LCD Monitor

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Backlight inverter aoc lm729 Schematic diagram Please I am a repair technician (Retired) Lcd layer working picture on screen backlight goes off intermittently and now for almost all of time. Flashes on for initial few seconds

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Here is the service manual: http://elektrotanya.com/?q=showresult&megnev=AOC%20&megnev2=LM729%20&kategoria=&kat2=all

You will need test lamp to verify if it is the inverter or the lamp assemblies.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, 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 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
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Posted on Sep 09, 2010

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Backlight inverter aoc lm729 Schematic diagram Please I am a repair technician (Retired) Lcd layer working picture on screen backlight goes off intermittently and now for almost all of time? This trouble maybe power supply or inverter boards is defective.
first you can test the voltage of the multr,and then check which part is defective.From Wisiny.com can find those parts
if you have any question,please let us know email:service@wisiny.com.thanks,we sincerely hope we can help you!
you can also check this boards whether suit you:
715L1103 AOC IDPC7425A3 Power Supply for TFT1780PSA LM729

Posted on Dec 23, 2014

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Posted on Jan 02, 2017

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Hi,

To my understanding, an AOC LM729 is capable of 1280 x 1024 and therefore should be able to display your preferred 1024x768 .

Perhaps you need to set the PC's Display Screen Refresh Rate to 75 Hz or lower (DisplayProperties/Settings/Advanced/Monitor).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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the inverter needs to be replaced
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I assume you only found the 4 mount screws in the back... You also need to take off the front silver edging - it pops off with some negotiating, but if you find the right spots and don't pry hard it will come off clean without too much difficulty. Then take out the screws that hold the screen inside and it should drop out.

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Where are the ring inductance coils on the power supply board?

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