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My heatbed stays on

Posted by Rive 
My heatbed stays on
June 04, 2017 02:37AM
So I just build my first printer a Prusa i3 and it's been working well for a day.
I started a new print when suddenly it stopped printing. Smelled something burning and saw smoke so I quickly unplugged everything. After checking all the cables it seems to come from the heatbed.
Everytime I plug in the heatbed cables, my power cable would get hot and the bed warms up. The led behind D8 stays red when I plug in the power. Everything else still works. I can still control the hotend temp. Bottom of the heatbed doesn't show any burn marks.

Should I get a new RAMPS board or just change the mosfet? How do i check if my Arduino is affected?
open | download - P_20170603_060050~01.jpg (129 KB)
open | download - P_20170603_060329~01.jpg (400.4 KB)
Re: My heatbed stays on
June 05, 2017 05:40AM
Disconnect the wiring to the heatbed then measure the resistance at the heatbed terminals and see what you get. If you are using a RAMPS board, check the green power connector (that plugs into D8) for burn marks - that would indicate cables not being tightened sufficiently.

Waitaki 3D Printer
Re: My heatbed stays on
June 06, 2017 05:56AM
After taking a closer look the mosfet to the heatbed was totally dark with burn marks. I just decided to buy a new ramps board.
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