This spot isnt bothering me much but I fear it might be begining of end of my screen
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No it will not spread,it will stay as it is the oleds in that region are just dead just avoid applying pressure to that region
As for warranty claim being eligible or not ,it depends on your provider or samsung itself check your disclaimer
As I mentioned earlier dead pixels are covered by Apple warranty for their IPS displays,I aint sure how samsung or any third party handles it
Samsung OLED displays are the most expensive ones in fact in most cases they almost cost same price as phone itself ofcourse half or much lesser for newer phones still expensive though in your case it would be around 15k but never attempt repair here in Pakistan I haven't seen a repair center where they'd use special glues used in reassembly of phones ,what they use aint as good
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