Iphone 3 connector LCD replace - Black screen no backlight way

I have a 3g motherboard with connector LCD number 1 broken.

I have replace the connector with a new, i think the solders are goods but i have always a black screen without backlight.

The motherboard seems to work fine, the restore on itunes is good but no display on screen.

Sometimes i can see some vertical lines but no backlight.

I have find a topic where a people give a solution for backlight with this picture:

I have check and i have continuity anywhere but not on the the blue line you can see on next picture:

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