Monitor comes on then goes black

Look for bulging capacitors on the board and replace with the same type. Have a repairman help you.

this can be a bad cap in the power supply

Your monitor has 3 years warranty, I would find out if you can get the replacement before opening up the case.
http://www.planaronline.com/product/?id=997-2723-00

First--was it working?
Did it suddenly stop?
When you see the LG logo, then it goes away, does the power light turn from green to amber? Sounds like that doesn't happen.
So--if you are getting a signal, you should see something.
If there is no signal, then the power light should change from green to orange.
With no lights at all, I suspect a faulty monitor.

your power supply needs to be repaired . you have bad capacitors. very comon problem

you have problem wit the lamp just plug in another once you removed the back cover and if the lamp stays on the it is 100%. you do not need original lamp. Any 15" lcd lamp that fits will do the job. HA HA well done
Ahmad
COMPBITS.COM.AU

I think you have the display shut off. the button on the bottom left will shut screen off. It will come on for a few seconds if you touch the screen, but will shut off again. just push the display button again and it should stay on.

Hi I have similar, I'm an electronics engineer and took mine apart only to find the power supply is very sick to the pint the pcb that converts all the signals probably has been damaged too, ie BIN FODDER.

Not very constructive but at least I know what is wrong - if I can get any constructive info i willl post it....

Check to see if the image is Dimmed. Chances are the power supply on the FPD is either dead or not supplying power to the back lights.
Your problem is the power supply or the inverter on your board, you can replace it and it will be fixed.
Easy Fix REALLY EASY FIX
(inverter is what supplies power to your backlights. A lot of the times the reason a monitor goes black and the green power button is on, is because the backlights shut off. in most designs of the 1730 the inverter is embedded on the power supply. That is most often the case on this problem. Power supply/Inverter=Replace it and you will have a spanking new looking nice monitor working again. :)

I have the same monitor and it is only 3 month's old, the power lock button continues to fail and they have replaced it 3 times with the same issue, What a piece of ****!!!!