Acer 792G Grainy Screen

Hello, I have recently purchased Acer 792g 75X0 model, which had very grainy screen and it just bothered me.

I decided to ask for replacement and took other model hoping that it wont have this problem. I took 792g 79KG.

However, this one also has grainy screen.

Do all acer 792gs have grainy matte display ?

Thanks,

Stefo