Tuning knob

Gigabyte
 

I just assembled my V5 with Nextion 3.5E screen in a case and the tuning encoder knob doesn't seem to work.  I've checked and double checked everything. Does anybody have any suggestions on what to do to troubleshoot it.  I can click the wheel.  Turning it every once in a while will move the frequency display a little bit, but most of the time it does nothing.   

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