Posted 08 March 2026

I’m still having problems with the Neopixel LED string on my T1 (red) Stealthburner toolhead. It stops working, then I wiggle some wires on the toolhead and it starts working again – temporarily.

To start the troubleshooting process, I swapped just the front part of my two stealthburner toolheads. The T0 (grey) Neopixel installation works fine on the T1 (red) body, but the T1 (red) Neopixel installation does not work on the T0 (grey) body, indicating that the problem is isolated to the T1 (red) Neopixel installation.

In a previous post I described connecting the string to a Teensy 4.1 using an AdaFruit Neopixel test program, so I dug out the Teensy 4.1 and the 3-pin 2.0mm male JST plug adaptor from this post, and connected the Teensy to the T1 (red) Neopixel string by disconnecting the Neopixel JST connector from the ‘SBurner Fan Adaptor V1’ and then connecting it to the Teensy via the 3-pin male JST, as shown in the following photo:

With this setup, the Neopixel string worked perfectly, so the problem is either in the Fan Adaptor board connector, or something else upstream from that. When I swapped just the front parts, I essentially eliminated everything upstream of the Fan Adaptor boar, and by exercising the NeoPixel string via the 3-pin JST connector I eliminated everything downstream of the Fan Adaptor module, leaving just the module itself. Plugged T1 (red) back into its toolhead 8-pin connector and everything worked! Came back this morning and turned on the printer; now the T1 LED’s are dead again.

It looks like this is one of those intermittent issues that just don’t go away. At this point I suspect that the 8-pin inter-board connector is the real issue, and I’m not sure there is anything to be done about it. If this is in fact the case, then it is the female half on the Fan Adaptor board that is faulty, as the T0 (gray) toolhead front module works fine when plugged into the T1 (red) main body.

All for now – stay tuned.

Frank