My Samsung tab s6 SM-T860 tablet screen shows black and white strips.

Samsung galaxy Tab S6 bought last year February. I left if to charge and it was 100% charged and suddenly white and black strips covered half of the screen. And then I unlocked it and display suddenly started getting darker. They say it takes 500$ to replace the display with a original but it has been only 4months after warranty

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 1
crwdns2934285:0crwdne2934285:0