Need an opinion, screen messed up or it's connector? MSI GE72 2QF APACHE PRO lap

Hi,
I have this GE72 2QF APACHE PRO laptop for about 2 years. (using it for ~1.5).
The screen had burned green pixel on it from day one But never mind that...

I always had it connected to a separate monitor and used that other monitor as the main display, and turning ON and OFF the laptop's when I need an extra screen, in Extend mode.
Yesterday while i was playing some YouTube videos on the laptop display and playing Hearthstone on the main display (the external one) I noticed the colors on the laptop's went pink.
A text from the YouTube video got burned on the screen (so it was visible if I put a white background there).
And turning it on and off didn't fixed it.


Opening/Closing the lid slightly (or more than that) doesn't seem to cause any effect on the colors, they are just pink when the display is ON.
I added links to 2 YouTube videos I recorded showing what I'm talking about.
Links:
Video 1 Video 2


I wonder if it's the screen's fault or it's internal connector to the laptop's motherboard/GPU (so replacing the screen won't help) ?

Hope you have some knowledge about this, Thank you.