Question Laptop screen: Black and White gird of dots

kappa_800

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Feb 21, 2011
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Here's what happened:
  1. One day a white horizontal line appeared near the top edge of my laptop screen. Now I've 3 lines, and 2 of them flicker.
  2. Sometimes screen goes all bright and then black-red colour. If I lower the brightness it gets better again.
Things I've tried:
Connected an external monitor, output is fine. I've removed the front bazel thought some cable might be lose or damaged. Can't find anything wrong.
My laptop is Lenovo Z50-70 with 1920x1080 display. It has hybrid graphics (Intel HD & Nvidia 840M). I've updated both drivers.
Pic 1
Pic 2
Pic 3
Pic 4

Is my screen dying or could it be cable or something else? Thanks
 
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