Re: Melzi - Heated bed is being powered via the USB cable

Thanks for that useful information.

I narrowed the problem down to the power terminal on the Melzi and while desoldering the terminal to replace with a new one, the solder pad came off. It must have been making a poor connection due to the pad being damaged. The terminal twisted a bit when I tightened the screws so that could have caused it.

Thanks to nophead for suggesting I scrape the solder resist off next to the hole and solder a wire between the new pad and the ground pin. Everything is working again.