My Kossel Mini used to work with the above electronics but it somehow failed to start up suddenly. When it is powered up, the LED1 on ramps blinked twice and there LCD no loner lights up. I tried to download the firmware again but my computer can no longer connects to it. Even I unplug all the sensors, motors, peripherals, the board is not responsive. I have also tried switching to USB power source with no luck. However, the arguing board does seems to work as I can download firmware to it if the ramps board is unplugged.
I guess the ramps board has failed and I wonder if there are anything to check or potentially fix? I have test the two fuse and they look fine.
On the other hand, I was wondering if my 12V power adapter has cause the isse. I tested it with my multimeter and it is outputting something at 14.x V. Will this cause and issue to the boards?
