[ Hi, i am new to hobby, I have had some successful prints, I built an enclosure for the printer, when hooking up the electronics, I crossed the + and - 12volt lines to the board and I think it is fried, ext does not work, bed heats up without selecting, lcd is blank etc. My question is replacing the board (a Melzi with Marlin.) If I were to purchase a board such as the one in the attached picture, would it work out of the box or is there more to it ? I cannot get any response from the seller.
Thanks for any help you can offer.
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