Sctratches on the display inside

I’ve seen quite a few laptops coming for repairs lately with a very weird defect.

The display have very tiny cracks, but of the back of the glass, like someone worked it with a rake from inside. No visible case fractures or other defects exist, and the cracks don’t affect the displayed images, so the matrix itself is not damaged. The cracks are visible only under specific angle and lightning conditions. I came across this on mostly Asian brand ultrabooks, like LG, Samsung, ASUS and Acer. Is it manufacturing failure or user caused damage? Well, that obviously is for the service center to decide if you have to pay for it or they replace the glass for free.

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