Because of an stupid accident the MOSFET's gate on my reprappro huxley is blown.
Now the heatbed don't stop rising tremperature when I plug in my machine.
Does anybody know what to do now?

Thanks
heimFABrikant

I would guess replacing the MOSFET would be then next thing on my To Do List.

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Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

Update:

It is a littele bit confusing because now the heatbed is working again....but in the wrong direction (when I turn it ON it stops heating).
Maybe I can fix this by editing pins.h in the firmware, i will try this later.
I read threads of other users who had similar problems.
However, if theres need to replace the MOSFET, I don't now where to get this spare.

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Freiheit heisst das zu tun was man will, solange man niemand anderem schadet.

It's always a good idea to measure wether the gate voltage of the MOSFET, that's the pin connected to the ATmega, matches your expectations. 0V when off, 5V when on and varying in between after reaching temperature.

There are many MOSFETs which fit, as long as the MOSFET is big enough. Common choices are IRL 3803, FDP 8870, IRLB 8743. For details, see [reprap.org]

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Generation 7 Electronics	Teacup Firmware	RepRap DIY