I have an FDM 3d printer that used to run on RAMPS 1.4. After accidentally destroyed that board, I bought a 1.6 board to replace it. I have it connected to a 12 V 30 A power supply, but when I turn on the power, the power indicator LED on the supply briefly lights up and then dies. A multimeter reading between the power terminals gives 0 V. When I disconnect the RAMPS board from the supply, the supply runs fine.
This suggests to me that there is a short somewhere, but I am not confident in that conclusion. How do I check the integrity of my board? Is there a way that I can unit test any of the components?
Notes: The internet has some people talking about quality issues with the 1.6, like bridging and cold solder joints, which I have checked for; I cannot see anything wrong.
I currently have all of the steppers, limit switches, and thermistors connected. I have the stepper drivers installed, each with all 3 micro-stepping jumpers installed.