The heat bed pulls about 7 amps. The heat bed wont turn on anymore via the controller. The fuse seems fine (tested with multimeter). The D8 pin (I think this was the pin on the arduino that controls it) still goes high and low when I toggle it. I think it is just the MOSFET blowing up?? Is there anything else that could be going wrong?by mklinker - RAMPS Electronics
I re-measured the resistance to be 2 ohms. It is annoying because this whole thing worked fine... the heat bed appears to be fine (no burn marks or anything) but now I can only intermittently get the printbed to turn on.by mklinker - RAMPS Electronics
I have a Mendel 90, so no way for it to be shorted by the frame.by mklinker - RAMPS Electronics
I have been running RAMPS 1.4 for about 6 months now. Yesterday after a 4 hour job I noticed a burnt electronics smell around the controller board, and now my heat bed wont stay for more than a minute. The fuse is too hot to touch, and the mosfet is also very hot. Resistance of my heat bed (Mk2) - 2.6ohms Voltage of 12v PSU for heatbed - 13.2 volts The mosfet has a heatsink and the fuses are nby mklinker - RAMPS Electronics