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Samsung Galaxy s7 with screen problem

Two weeks ago I replaced the screen on this samsung galaxy s7 for a customer and they have sent me a message today with a problem with the screen. They have told me that it has been on the desk the whole time and that the glass isnt damaged at all. Could I please have everyones opinion on what the purple mark is and how this could have happened ?.

Thanks

Here is a photo of the screen :

https://imgur.com/mjohCx2

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More or less a damaged LCD Screen.

Look for any dents and what not. Could also happen from applied pressure, banging, and a bunch of other stuff.

See if it appears when you put it in Odin mode, or when you're going through other apps. If it's still showing then it is a damaged LCD. Replace it.

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Looks like the OLED screen is broken and need to replace a new one.

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