Chosen Solution
I have changed the logic board as the lcd connector was damaged. I have put all the parts back and only two led lights are on and the screen is black. When I connect the external monitor third diagnostic led goes on but there is no image on the external monitor. I. cannot figure out what is wrong. Anybody had similar issues? Thanks a mil for help
With the internal display connected and powered take a bright flashlight held against the screen at a sharp angle are you able to see the faint image of your desktop and it’s icons? Make sure you don’t mar the screen! If not then you likely have either a bad connection or a bad GPU board.
