RAMPS won't give power to Arduino

Hi,

I've got a little issue with my ramps board:

When connected to my 12v power supply, the arduino doesn't do a thing.
Normally Ramps should push the power trough to the arduino no?

When I connect my arduino via usb, everything is fine.

Anyone got a clue what's going on?

[www.reprap.org]

Did it used to work? 'Cos it may be that your Arduino's 5V regulator has blown. This happened to me (I think I must've accidentally shorted pins while setting the stepper driver voltages) and couldn't understand why the thing only worked when the USB was plugged in.

Forum searches turned up the link hercek posted above, but my RAMPS was fine. I eventually found out about the AMS1117 regulator issues, bought some off eBay and replaced the one on mine. Mine works fine now, Yay!, but you have to be reasonably proficient with a soldering iron and surface-mount components.

Lots of info here, incl how-to videos: [www.google.com]

And this was where I got mine (satisfied customer, no affiliation, yada, yada): [www.ebay.com]

Edited 1 time(s). Last edit at 08/21/2016 11:27AM by meq123.

Thank you, i will check it out!

it used to work, I use a salvaged pc PSU to power the board. Now it just switches off the bed instantly when turning it on.

Edited 1 time(s). Last edit at 08/27/2016 02:49AM by Tjahzi.

Maybe you have a short somewhere?
PC power sources have over-current protection which switches them off when there is short.