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I have another Teensy. I'll wire it up this week and test...maybe I messed up this board somehow....

Thank you for all of your input, honestly.

My digital meter is at home, however, with the analog one at the office, both the DC jack, and the 5v VIN so ~5v (wire from DC to Teensy disconnected)

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EDIT: The ground plugged...

All wires test good. I cannot figure out why it needs its 5v connector energized.

Connection has not been cut.

Ok. I'll start testing wires.

Thank you sir.

What do you think would cause it? (Before I added the Level Shifter, the T4 would run without being plugged into USB, now it HAS to be plugged in)

Also, not that I think it would matter, however,...

Sooooo...it turns out I did need the 5v pin.

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If I unplug it, then the strip dies.

I soldered the pins I was using, GND and pin 11. The 5v was not soldered as I had read that I did not need it because I am using an external 5v source. I forgot to pull the lead before the photo. ...

Good morning. I received my 74HCT125 and wired it up based on what others who are using a T4 and NeoPixels . I can no longer get anything to display, even the standard StrandTest.

I am running ...

Also, if the LEDs are lighting without issue when running the Example "Teensy 4" -> Adafruit NeoPixel -> strandtest would I still need to be worried about voltage?

Looks like this thread may be what I need to reference.

Is this what you were suggesting?

Saying that I am still testing with Pin 11, that shouldn't that cause the error in color reproduction, correct?

If so, I may very well need to smack myself for my mistake.

I use two 5v 10a PSUs...

Background:

- This is for work.
- I am using a custom three display Processing (v2.2.1) sketch on a Win 10 machine that connected to my UNO R3 via USB running 'LEDstream_FastLED' on the UNO....