megatronics v2.0

Please help,
I have a megatronics v2.0 and i can't control it without the connect of USB.
When i connect the megatronics to 12v, the lcd doesn't work but the PWR led is on.

Did you set the jumper to use on-board 5 volt power and not USB 5 volt power?????

I set a jumper on 5v-USB and SRC 12 V

Where i can set a jumper to use on board 5v

The board worked on 5v USB and 12v but now just work with usb power.

Quote
john G
I set a jumper on 5v-USB and SRC 12 V

http://reprapworld.com/mt/datasheet%20megatronicsv2.pdf

If I read the datasheet correctly, you should have a jumper on either SRC12v or 5V USB...but not both at the same time.

Assuming that you have 12V or less on the 12V1 input and the jumpers set as described, the next thing that I can think of is that the on-board 5V regulator is fried. I have read more than one report here of SainSmart Megatronics2 boards popping the 5V regulator from nothing more than a brief tap of a mis-wired endstop switch. When mine fried, I just ran it from USB power since it wasn't worth fixing when I was about to buy a 32-bit controller board.....