So I have a reprap prusa i3, that came with a ramps 1.4 and arduino mega 2560.
I managed to upload marlin to the mega without external power connected, then connected my psu, which made a pop noise and smoke came from the Megas USB chip.
I thought something might've been wrong with the mega so I ordered another, double checked all connections to the ramps and tried again, when the same thing happened.
Then I ordered another mega and a new ramps. Moved the stepper drivers over from the old ramps to the new one and tried again. This time there was no smoke or noise, but the USB connection failed to be recognized after.
In all 3 cases, whenever my external psu was connected and USB connected, the USB cable would get extremely hot. I'm assuming there is a short somewhere but not sure where.
Could one of the stepper drivers be borked and cause this? Or something else? What can I do to troubleshoot?
Thanks!!
PHOTOS: [imgur.com]
I managed to upload marlin to the mega without external power connected, then connected my psu, which made a pop noise and smoke came from the Megas USB chip.
I thought something might've been wrong with the mega so I ordered another, double checked all connections to the ramps and tried again, when the same thing happened.
Then I ordered another mega and a new ramps. Moved the stepper drivers over from the old ramps to the new one and tried again. This time there was no smoke or noise, but the USB connection failed to be recognized after.
In all 3 cases, whenever my external psu was connected and USB connected, the USB cable would get extremely hot. I'm assuming there is a short somewhere but not sure where.
Could one of the stepper drivers be borked and cause this? Or something else? What can I do to troubleshoot?
Thanks!!
PHOTOS: [imgur.com]