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

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.

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:[email protected],we sincerely hope we can help you!
you can also check this boards whether suit you:
715L1103 AOC IDPC7425A3 Power Supply for TFT1780PSA LM729