I have a HP Pavilon dv1000 laptop and the screen flickered with black lines for about five months before going totally dim. I have had both the backlight and the inverter replaced and the screen still does not light up. Is this a motherboard issue? Or is it a cable issue? Can this be repaired or does it have to be replaced?
Have you tried reconnecting the video cable on the motherboard? It’s possible that the video cable is not making a good connection with the motherboard and reconnecting the cable can help. Just unplug the video cable from the motherboard and plug it back in.
Does your laptop have a display close switch? The display close switch is a small button located somewhere close to the laptop hinges. This button turns off the backlight when you close the display. If the button got stuck inside, the backlight will not turn on even when the laptop is on and the display is opened. Try tapping on the lid close switch and make sure it moves up and down without any problem.