Amazon touchscreen not touching

I have BBx50 woodworker with z20/PWN spindle. I wanted to upgrade the screen to something larger and watched the onefinity youtube video showing an amazon touch screen upgrade. I purchased the one he recommended. While the screen works great, the touchscreen doesnt function at all. I see a mouse curser on the screen when I boot up but it doesnt respond.

My 7.5" screen still works fine and uses the same 3 plugs (usb-cx2 and hdmi) I’ve tried changing the order of the usb-c plugs. I’ve tried plugging the power usbc in the monitor first then booting the machine. Nothing seems to work. I even did a return and got a replacement.

Has anyone had this issue?

I had the same issue with a generic aftermarket touchscreen. Using a higher output power source resolved the issue. It mattered which USB port the power was connected to and as a matter of habit I turn on the monitor first and then the BB.

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