Blurry / Fuzzy LCD screen on Aspire 9410z

I have an Acer Aspire 9410z laptop, and the display is vague and blurry. So no clear legible image. For clarity, there are no vertical stripes that are continually displayed.

The stripes appear from the BIOS but they are always different in form.
It looks like the following links:





- If I connect an external monitor, I can see everything clear/sharp
- If I make a PRINT SCREEN on this laptop, and sent this by email to a different PC then I see the PRINT SCREEN perfectly (so a normal desktop view).

So this should mean that the Video card does work properly.
The latest NVidia drivers are installed.

I have replaced the ribbon cable from another identical laptop, no difference.
I replaced the inverter but it also came from a second hand laptop and inverter that did not work anymore, so therefore I had only black screen.
You would think that the original inverter is still good.
Or can it also cause these streaks? In that case I would consider a new one?

Can this be caused by the LCD screen itself? Then I would assume that the stripes would be instantly on the same place but they aren’t.
I checked all cable connections.

Someone advice or other angles?