Hi guys, I just put together my Prusa i3 from DIYTechShop (don't buy from them BTW) and on plugging in the power to my PSU something on my RAMPS immediately let out a big puff of the magic blue stuff :'( I think I might've connected the 12V to the RAMPS backwards... dammit. Anyways I looked around the board and I don't see anything obviously burnt or blackened, couldn't see soot or melty bits anywhere. So I'm wondering; where should I look first and what components did I likely fry? I read somewhere that the diode D2 will blow if the voltage is put backwards but I'm curious if that's the only thing that would go bad. I just hope I don't have to order a whole new RAMPS and Mega. https://reprap.org/forum/read.php?219,369975,369975#msg-369975 Mon, 14 Sep 2026 13:54:47 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,369975,372797#msg-372797 https://reprap.org/forum/read.php?219,369975,372797#msg-372797 vreihen RAMPS Electronics Sat, 21 Jun 2014 10:39:07 -0400 https://reprap.org/forum/read.php?219,369975,372648#msg-372648 https://reprap.org/forum/read.php?219,369975,372648#msg-372648 wingman358 RAMPS Electronics Fri, 20 Jun 2014 21:42:33 -0400 https://reprap.org/forum/read.php?219,369975,370312#msg-370312 https://reprap.org/forum/read.php?219,369975,370312#msg-370312 Cefiar RAMPS Electronics Sun, 15 Jun 2014 19:05:20 -0400 https://reprap.org/forum/read.php?219,369975,369975#msg-369975 https://reprap.org/forum/read.php?219,369975,369975#msg-369975
I think I might've connected the 12V to the RAMPS backwards... dammit. Anyways I looked around the board and I don't see anything obviously burnt or blackened, couldn't see soot or melty bits anywhere.

So I'm wondering; where should I look first and what components did I likely fry? I read somewhere that the diode D2 will blow if the voltage is put backwards but I'm curious if that's the only thing that would go bad. I just hope I don't have to order a whole new RAMPS and Mega.]]> wingman358 RAMPS Electronics Sat, 14 Jun 2014 21:05:10 -0400