[Q] Lg L9 backlight problem - LG Optimus L9 P760, P765, P768, P769

Hello,
I have a LG L9, and there is not backlight on the screen. I can see the logo and the menu so the lcd is working. I changed the lcd for a new one, but it did not help, the error is same.
Do you have any idea?
Thank you.

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