imac24" 8,1 Backpanel fail

My early 2008 imac 24" lcd panel starts to flickering and go black, and after a while the screen start up again... for a random of secunds for going to black again.
i had try Reset Pram and SMC and rund Apple Hardware test. (No errors)
i had also try put a secund monitor into the minidvi and that works.

when i take a Flashlight and light into the screen.. i can see graphic.
so it not Graphic chip that dead.

i try replace the main logic board and that did not help.. still black screen.
i try replace LCD Screen and that did not help either.
i had also try remove the LCD Temp. cord ... Fan Starts up... but screen still black.

what next to try?
I think that must be a component that control backlight to turn on/off that fails. but where is that? is that build into the LVDS cable or in the powersupply?

 

i do believe that the inverter board is placed in the LCD Panel that i had try replace with a other LCD Panel.

But again... there is a slidge change that the LCD Panel i brought from ebay had the same issue..

 

well.. i had just ordred servel cables now... for about 100 Dollars...

iMac 24" Inverter Cable 922-8856 (Model A1225)
iMac 24" LVDS Cable GS20091
Intel iMac 24" Inverter Power Cable

then i had use about 500 Dollars trying to wake up my imac from backpanel issue.. ill cry my self to sleep if it "Only" was a inverter cable to 15Dollars...

 

And a update...
Changing the iMac 24" LVDS Cable did not wake my imac24" back to life...