Fan Problem - Blown Board?

Phaedrux

Does the MOSFET look blown?

Gary

@Phaedrux MOSFETs look okay. Do you know if the WebGUI fan speed slider issues the M106 command?

Phaedrux

Yes the slider is the same as sensing m106.

Gary

@Phaedrux I've taken molex off fan header connections and attached direct to 24v. All fans/wiring okay. My mistake about speed - it's just a quiet - ish fan.

That's maybe something if m106 and the sliders have no effect?

send M106 P1 H-1 and heatsink fan comes on. No change to WebGUI controls
M106 P1 S0 fan stops (WebGUI speed sliders - no effect)
M106 P1 S1 fan on (WebGUI speed sliders - no effect)
M106 P0 S1 no change to part cooling fan - still off

Gary

@Phaedrux Tried the following:
fan0 Molex into fan2 header
config.g changes
;Fans
; M106 P0 S0 I0 F500 H-1 ; Disable FAN0: Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P2 S0 I0 F500 H-1 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off

;Tools for p0
; M563 P0 D0 H1 F0
M563 P0 D0 H1 F2

It seems to work!

Phaedrux

It sounds like the Fan0 mosfet got damaged when the fuse was blown.

Gary

@Phaedrux Yeah. Nothing physically obvious. What also confused me was the 2 Fans on the WebGUI. I didn't notice that one was Tool Fan and the other Fan 0, which are the same. I thought one was the heatsink fan, which thinking about it now wouldn't make sense as it's not speed controllable. Thanks for your help.

Phaedrux

You can post a close up high res well lit clear photo of the fan port area so we can see if there is any damage.

Gary

@Phaedrux Hope it's clear enough.
![0_1597559615949_20200816_072939.jpg](Uploading 100%)
Getting:
Error

Input file contains unsupported image format

Phaedrux

Can you try putting the photo on dropbox or google drive or something like that?

Gary

@Phaedrux

Phaedrux

Nothing really visible, but it may still have failed.

A Former User

if you have a multimeter putting "multimeter mosfet" into google will show you how to test the mosfet properly its a little involved so doesn't make sense to repeat what google can tell you

Gary

@bearer Thanks I will check as I have now visually blown P3. Also P1 stopped working. So all 3 now not working! Is there anywhere in the UK that I can send the board to get it fixed?

(I bought pre-wired connectors, but I didn't see that although the connectors were compatible at the hot end the polarity was reversed to the fan. I wouldn't have thought that switching the fan polarity would have blown anything - the fans would just spin the wrong way).

dc42

@Gary said in Fan Problem - Blown Board?:

@bearer Thanks I will check as I have now visually blown P3. Also P1 stopped working. So all 3 now not working! Is there anywhere in the UK that I can send the board to get it fixed?

Send me a PM, I can replace the mosfets.

(I bought pre-wired connectors, but I didn't see that although compatible at the hot end the polarity was reversed to the fan. I wouldn't have thought that switching the fan polarity would have blown anything - the fans would just spin the wrong way).

Unfortunately, brushless DC fans don't work like that. A few types just don't work when connected the wrong way round, but most of them present a short-circuit.

Gary

@dc42 Thanks for the info about the polarity. That now makes sense! I bought some PMV20XNER MOSFETs, but the size of them is way beyond my capability.

I tried to PM you, but I get then message "This user has restricted their chat messages. They must follow you before you can chat with them"

dc42

Try now.