Neopixel stops when Fan starts

[SchwabJ]

Hello,

is there something strange with GND? My PCF shut down the Neopixels at startup.

(HARTK SB PCB)

[jamesc73]

I am having the same issue but only when the PCF is not 100%. Not sure if it's GND but I've tried changing that to a different terminal on my PSU and it made no difference. Just changed from an HARTK AB PCB and never had an issues with it.

HARTK SB 2 PART PCB

[staticanime]

I'm having the same issue with the 2-piece PCB, has anyone else found a fix for this? Picture of the front portion is attached below. LEDS come on when the system starts, as soon as I power up the part cooling fan the LED's cut out, can only turn them back on when PCF is off. Using the stock stealthburner_leds config included in my printer.cfg

For reference, I'm using: LINNEO Switchwire Harness: https://www.onetwo3d.co.uk/product/voron-switchwire-heluflon-wiring-harness/?attribute_pa_color=black&attribute_toolhead-pcb=Yes LINNEO Stealthburner LED Harness: https://www.onetwo3d.co.uk/product/linneo-stealthburner-internal-led-harness/?attribute_pa_color=natural-white-rgb&attribute_connector=JST+PH GDSTIME GDB5015 for the part cooling fan: https://www.onetwo3d.co.uk/product/gdstime-5015-24vdc-blower-dual-ball-bearing/ GDStime GDA4010 for the hotend cooling fan: https://www.onetwo3d.co.uk/product/gdstime-gda4010-axial-fan-40x40x10mm-24v-2/

[josephchh]

I have the same issue after installed the vorontap, it works perfect before I install the vorontap.

[dawm]

Same issue here, linneo brand board, also have tap installed. First/fresh build LDO kit, with all the wiring changes listed in the docs here.

[hartk1213]

I personally have never had this issue, so I can't say for sure what is causing it...seems interesting for sure...I'll see if I can get it to reproduce and see what happens

[islander2013]

had a similar issue also with the same 2 part pcb. however, mine would change color status for maybe 10 seconds and then randomly turn off....just the led.... then both the nozzle. however, it seems that by adding a in-line resistor near the mcu has made it more stable. not sure if this is a fix but saw it on the discord for the rainbow LED lights and thought would try.

• also meant to say using the SB kit by onetwo3d.co.uk which uses GDSTime fans with a linneo harness for 2.4

[dawm]

I've done everything I can think of, the ONLY thing that works is if i run a gnd wire from MCU all the way to the front PCB bypassing the toolhead board. Was thinking maybe I had a bad ground wire in my harness but I tried a wire from the LDO breakout 14pin gnd pin to the toolhead 14pin gnd pin, no change. Also tried a jumper from toolhead 14pin gnd pin to front pcb (so its not my gnd wire) as well as the 100 Ohm at MCU. Still only works if I run a wire from MCU to front PCB. Possbily bad toolhead board? But I have continunity everywhere it needs to be.

• had an idea.. so I unplugged tap and it functions as it should.. guessing a new 24v tap issue :|

[josephchh]

I point the tap pcb 5-24V input +ve pin to SBPcba 5V output pin, the neopixel works normal now.

[nibty]

I point the tap pcb 5-24V input +ve pin to SBPcba 5V output pin, the neopixel works normal now.

Thanks, this worked for me as well.

Following Hartk's suggestion and using the FS connector w/ 5v also solves the issue for me. https://discord.com/channels/460117602945990666/1041007230239125574/1046975414880444498

[jmillerfo]

I have recently upgraded to TAP using a PCB from DFH (5-24V version). TAP worked from the beginning and continued to work powered from 24V for more than a month and several thousand probes. TAP was/is connected to the Probe connector on a Hartk 2-piece SB toolhead PCB. Although there are reports that the 5-24V TAP PCB has failed on occasion, I have not experienced this although tolerance repeatability is sometimes less than predicted but still better that the stock probe. That being said, the Neopixels turn off as soon as the Part Cooling Fan starts. The Neopixels can be turned back on from the terminal but will turn off as soon as M106 is issued to change the fan speed.

I modified the main toolhead PCB as shown below. Afterward, the Neopixels operate normally and there is a slight improvement in the repeatability of TAP.

Note: My change differs slightly from those above in that both the FS and Probe connector now have 5V power. This allows me to use the Probe connector for TAP and still have the FS connector available for Filament out sensor.

[arhodiewithsoul]

I've done everything I can think of, the ONLY thing that works is if i run a gnd wire from MCU all the way to the front PCB bypassing the toolhead board. Was thinking maybe I had a bad ground wire in my harness but I tried a wire from the LDO breakout 14pin gnd pin to the toolhead 14pin gnd pin, no change. Also tried a jumper from toolhead 14pin gnd pin to front pcb (so its not my gnd wire) as well as the 100 Ohm at MCU. Still only works if I run a wire from MCU to front PCB. Possbily bad toolhead board? But I have continunity everywhere it needs to be.

• had an idea.. so I unplugged tap and it functions as it should.. guessing a new 24v tap issue :|

Please could I ask:

What MCU / board are using? When you say you run a GND wire from the MCU - are you coming off the DCIN (-ve) for GND or thermistor (-ve) pin (AGND)?

I'm experiencing similar LED issues on multiple MCU boards using 2pc Toolhead PCB's either with FAN0 and/or HE0. PWM signal causes SB LEDs to go off and only responds after PWM pins are no longer active. Z-probes are PL-08N/PL-05N on 24V.

Many thanks!