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Yes, this can be caused by  the connector - clean with alcohol and inspect the pins.  A small bit of dirt or glass from the old LCD can keep it from fully seating, and it's easy for someone to have damaged a pin when removing the old LCD.   If you have a microscope look at the pins and use a needle to try to gently move them - if they shift they're not soldered.  Some flux and a reflow should fix it.

The other cause, which is, unfortunately, more likely and more common but much more difficult to repair, is the touch control IC, numbered U2402 on the schematics (google that and you'll find videos of the symptoms).  As mentioned,  much more difficult to repair