Hotend not Heating Up

Hi all,
i have a Mendelmax on Ramps 1.4 which just worked fine. After a short at the hotend connector i have the following problem:
Hotend is not heating up anymore, Thermistor seems to be fine and returns temperature. Bed is heating up fine. Ramps is taking the desired temp for the hotend with no complaints just not powering the hotend (checked voltage). Fuses seem to be ok as well. Problem remains if hotend is detached (thermistor still on), even with a new thermistor.
Any ideas?
Thanks in advance,
Stephan

What type of a Resistor is your Hotend using?

It could be the faulty resistor as I have read that if the resistor heats up too much it may become faulty. Please correct if I am wrong in thinking this.

Sincerely,

Janski

I don't think that is the reason because i already bougth a new hotend (Merlin [www.reprapdiscount.com]) and the behavior with that one remains the same.

Quote
snoller
After a short at the hotend connector i have the following problem:

What shorted? If the leads to the hot end got shorted together, you may have damaged the MOSFET that provides power to the hot end.

Yeah, someone else pointed to this potential problem as well. Already ordered a couple of them. Will post when i soldered them in. Thanks.

ok guys - solved it! As i was looking after the mosfet's and detached the Arduino i saw that the board-connection between the mosfet and the power-connector was simply burned. Tried a dirty hack - worked, everything is heating up now again! Thanks for your support.



Edited 1 time(s). Last edit at 02/28/2014 12:04PM by NewPerfection.

Nicely done