How to check if the LCD Display is broken or its cable?

So i bought this laptop for a small price and i’m trying to fixt it, but i am not sure where the problem is: LCD Screen or it’s cable.

First of all i checked if the problem is with Graphic card by connecting it with an external Monitor, and fortunately it wasn’t the case.

But then i opened the laptop and tested the display in my personal laptop which is the same model, but i had the same results.

So clearly the problem is in either the Display or the cable.

this 2 photos will show you how the display reacts when i move the cursor to the bottom right corner

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additionally you can see in this video clearly the problem with the display screen when there are a different colors.

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