Screen flickering when I use a sim card

I've just replaced a screen on a Huawei p20 lite, one thing I've realised is that the screen flickers heavily when I enter the sim tray. I took the sim tray out and the screen works perfectly. Does anyone know the reason behind this?

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When the SIM tray is inserted, does the screen flicker more around the SIM tray?

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Hi, no it flickers all over

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I think the issue could be with the screen connector, which could be disconnecting every time there is pressure from the sim card tray. I would recommend pushing at different spots on the phone (to see if it will flicker), and possibly inspecting the display connector.

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Is there any way to prevent the screen connector connection from becoming loose? I've tried reconnecting all the wires multiple times, however, still no luck

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@syed.213shah unfortunately, I think the only option would be to get a new display.

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