imac24" 8,1 Backpanel fail

my 2008 imac 24" lcd panel starts flickering , go black, , after while screen start again... random of secunds going black again.
had try reset pram , smc , rund apple hardware test. (no errors)
had try put secund monitor minidvi , works.

when take flashlight , light screen.. can see graphic.
not graphic chip dead.

try replace main logic board , did not help.. still black screen.
try replace lcd screen , did not either.
had try remove lcd temp. cord ... fan starts up... screen still black.

next try?
think must component control backlight turn on/off fails. that? build lvds cable or in powersupply?

 

how inverter? 1 of cheaper things replace , go 1 failing backlights.

 

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