Half of Pixels Not Lighting

[Bob Musil]

I have the RGB Coro Candy Cane Prop, which runs on a Pixie 4 controller.  It uses 50 pixel strings.  3 of the 4 props work fine in the HU test mode. On the 4th prop, only half of the lights are lighting up.  It appears that the first half light up, and the back half is not lighting at all.  Any suggestions on troubleshooting steps is appreciated.

[TheDucks]

Bad Node (chip) OUT. It could be the Do is bad or the Di on the next node.

Before you start. Press the white button on the Pixie. That runs a test pattern.

If that fails, it is the string ,

One more test is to swap ports, just in case ...