So, I blew up a WK8 P9 at TR5

Legrand

As the subject says, I have a Duet WiFi, V1.02, and a wire was ripped from the hot end assembly (fan wire, if I recall correctly) which shorted the board. The board boots up but it's not working correctly anymore. It appears as though a component labeled "WK8 P9" (transistor, I assume) with three leads on it located at TR5 blew up.

Can someone tell me what this is so I can attempt to get a replacement and fix the board?

Thanks.

grizewald

TR5 is a PMV40UN2 N-Channel MOSFET.

Data sheet here: Nexperia PMV40UN2

It controls the part cooling fan, so that matches with the short circuit.

Legrand

Awesome. Thank you!

worekarolis

Anyone knows if PMV40UN2R is the same ting? Cant get PMV40UN2 anywhere

droftarts

@worekarolis see https://docs.duet3d.com/en/User_manual/Troubleshooting/Parts#fan-mosfet for alternatives.

Ian

dc42

@worekarolis is the board working apart from that fan output?

worekarolis

@dc42 @dc42 Yes seemingly everything works except fan and smart effector lights.

Also I think I've found right MOSFET:
https://www.digikey.com/en/products/detail/onsemi/MMBFJ211/1049196

dc42

@worekarolis that mosfet is not suitable.