Gaming problem with DS Lite top screen ribbon cable

[Diosoth]

I have a DS Lite I wanted to sell but I'm having issues with the top screen. I've reseated the ribbon cable several times but the connection still seems messed up. The L button will brush up against it or even moving the hinge can break the connection between the cable and motherboard ever so slightly.

Is the ribbon cable itself going bad? If I can't solve this issue I'll have to sell the system for parts