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white lines showing on screen after display replacement

I tried to replace display of Samsung A50 but I saw a huge white line on the screen and also a black area at the bottom of screen appeared. At first i thought new lcd has problem but I see same issues after replacing the new one with original lcd. Do you have any idea about this issue?

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Ehsan Hosseini check the connector and make sure that all the pins are properly aligned and that they are not bend or broken. After that it will be an issue with your logic board. Check the components around the display connector. You can also post some good pictures of your circuit board (front and back) so that we can see what you see. Post those pictures with your QUESTION. Adding images to an existing question

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