It turned on but black screen

I have same problem. My Macbook A1342 Late 2009 turned on but the screen is black. I can see everything on desktop with a flash light. My story are following:

The old screen is freezing at some point when starting up. I have to fold/move the screen a bit to get it fully started up. So i thought it is LVDS cable

I tried to replace LVDS but nothing changed. My bad when i tried to connect wrong end of LVDS. Then my old screen is gone. Nothing show up on screen even with a flash light. It still turned on, took installer disc and made sound like it reading the disc.

Now it ordered a brand new lcd screen panel. It turned on but black screen. I can see everything on desktop with a flashlight.

I did not see apple logo on back of screen light up.

Do you know how to fix it?

I tried to clean LVDS ends but nothing different