Unfortunately I also don't have any suggestion regarding your problem. The (capacitive) touch screen should be operational as soon as its plugged in. These components are baked together in the display to create one unit (visually and alignment-wise), so it's several layers laminated together or whatever.
But technically they're independent devices with independent connector cables. So it's possible for the screen to break but touch still work. Or vice versa. If the cable is plugged properly and the contacts are clean it should work :-/
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