M201 Help! It won't turn off (the hotend that is)

[mark2]

So while cleaning out my hot-end over the weekend, for some reason I had a situation where the hot-end heater wouldn't turn off (even after a full power off and on again).

I took my board out and measured the mosfet, and sure enough it was knackered (shorted between pins).

After desoldering the mosfet I swapped the it with the neighbour and checked all the resistances before putting the board back on the printer again.

Imagine my surprise when the hot-end started heating immediately again, and I still can't turn it off.

Is it likely something more serious? If so is it repairable? or do I need a new board? I followed all the steps on the following thread;

viewtopic.php?f=19&t=17039

Can't find a replacement M201 board on the Geeetech site, what are my options? Is this a common problem? it's the second issue I have had with the hot bits...

Thanks
Mark

[William]

So while cleaning out my hot-end over the weekend, for some reason I had a situation where the hot-end heater wouldn't turn off (even after a full power off and on again).

I took my board out and measured the mosfet, and sure enough it was knackered (shorted between pins).

After desoldering the mosfet I swapped the it with the neighbour and checked all the resistances before putting the board back on the printer again.

Imagine my surprise when the hot-end started heating immediately again, and I still can't turn it off.

Is it likely something more serious? If so is it repairable? or do I need a new board? I followed all the steps on the following thread;

viewtopic.php?f=19&t=17039

Can't find a replacement M201 board on the Geeetech site, what are my options? Is this a common problem? it's the second issue I have had with the hot bits...

Thanks
Mark

Hi,
Was your h-thermistor normal?
Additionally,have a try to reload the firmware plz.

[mark2]

Hi, thanks for the response.

Yes, thermistor is working fine, hadn't considered flashing the firmware, so I will definitely try that.

To the other question though, is it possible to get a viable replacement board?

Will let you know how it comes out.

[William]

Hi, thanks for the response.

Yes, thermistor is working fine, hadn't considered flashing the firmware, so I will definitely try that.

To the other question though, is it possible to get a viable replacement board?

Will let you know how it comes out.

Have you checked all in the post?
http://www.geeetech.com/forum/viewtopic ... 19&t=17039
And was the hotend fuse normal?
I'm thinking,you know,is it possible the mosfet neighbour you have changed is also bad?

[fahez]

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