Help Debugging with Nano and Addressable LED

raschemmel:
Are you using rosin flux ?

I don't think so, I'm using the tin provided in this kit on Amazon

larryd:
Do the following in order:

Run the simple ‘blink’ test, does it work?

You might have a bad D6 or Nano.

One of your connector wires may not be crimped properly, check for continuity.

If ‘blink’ works, try D8 as your output.

You might have a bad first pixel, cut the 1st pixel off then re-solder.

I'll run through these and get back to you. Blink test works though!

runaway_pancake:
Is D6 connected to the Data_In pad.
It may be it's connected to the Data_Out??
Try the other?

I'm not sure what you mean here, does one side of the d6 pin do input and the other do output?