Hot end fan not working - UMO+

[Thams 0]

Hi Ultimaker Community

My Ultimaker Original+ hot end fan has stopped working. I first tried a new fan however that didn't work, I measured the FAN PWM output with a multimeter and when I have Fan Speed = 0, I get a voltage of 2.4V and when I turn up Fan Speed = 255 I get 2.2V

The PCB is a Ultimaker Board Rev 2.1.4 and I suspect that the transistor controlling the fan is broken however I can't find which it is nor the replacement model is. Is it possible to replace the transistor or do I have to get a new PCB? Or am I missing something?

BR

Christian

[neotko 1,417]

Transistor BC817

https://ultimaker.com/en/community/11366-cooling-fan-always-on-umo-update-now-voltage-its-0

https://ultimaker.com/en/community/17214-fan-pwm-output-0v-umo-board-solved-not-solved

Specially check this post, I made photos of how I changed it. So far I changed the transistor 6-7 times