Chosen Solution
I want to buy it and in the worst scenerio just to change the display but idk if it is display problem ot motherboard
(i contacted the seller he said the display was placed poorly but i don t think i can trust him (the phone is around 200 euro ) )
Cannot be certain, but those artifacts look quite “analog” not digital, which to me says it is indeed most likely a panel issue not something to do with the logic board.