Hey all my Samsung galaxy s23 Ultra has a dead zone on the screen I got it replaced a month ago on 31st May of this year due to the green line issue, and this problem has appeared after that i have tried everything possible and it's still under the 3 month warranty.
If you had your screen replaced a month ago, you should still be in the warranty period for whoever did the replacement. Bring it back and have them evaluate it. As @Robin621k asked, did you take it to an official Samsung servicer and did they use an OEM screen?
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