Question about RAMPS 1.4 boards

Hello all,

please forgive if this has been asked, I searched and couldn't find anything similar to the issue I am having.
I started my quest to creating a DIY CNC machine. I went with the project Root 2 CNC multitool router 3D printed parts by sailorpete Root 2 CNC

I have the Arduino Mega and RAMPS 1.4 board with a 12V PSU.
So far I have blown two RAMPS boards out instantly upon turning on the PSU.

I have thoroughly checked my PSU and also went as far as to swap out my PSU.
They both provide a solid 12V signal as per my multi-meter.

The blow out (or mini fire) always happens in the same spot on the RAMPS board.
Near where the 12V power connector is, there is a small resister that instantly Pops! and then smokes or catches fire. I have multiple 3D printers so I decided to try taking the RAMPS board out of my old Robo 3D R1+ and use it on the same PSU and setup, It works totally fine! no issues whatsoever? I ordered these RAMPS boards from amazon and I know they are "Cheap Chinese" but they have had good reviews. I can't imagine that two boards from two different vendors had the exact same faulty resister? I'm not an electrical engineer, so maybe I am missing something? I have provided two pictures below, the black RAMPS board is from my Robo 3D printer and works fine, The red RAMPS board is from amazon and is the 2nd one to blow up.

I have circled the area with the resister on both photos. you can clearly see the black Robo board is different from the Chinese board. Any suggestions or help would be greatly appreciated in figuring out this dilemma.

 

thanks 3dmon, so based on the images above, going from left to right on the green connector, is it RED/BLACK/RED/BLACK or is it BLACK/RED/BLACK/RED?

 

Thanks, and yes i did have it RED/BLACK/RED/BLACK. I also ran to radioshack and got a pack of diodes, replaced the bad one and it popped again?! im I just cursed?

 

also the black board from my printer is fine!

 

Thanks Justin, that was it!

 

thanks to you as well Mon!