think I fried my Arduino (3 replies)

was getting ready to install a bltouch and added the 5v jumper. I wanted to test it with a multimeter and opps it shorted them out and it rebooted...

• it powers up, slower then it did before
• can't control any of the steppers (choosing move on the LCD does nothing - ( tried moving X, Y and Z )
• can read the temps (displayed on the LCD screen)
• can't read the SD card if I plug the card in the display flashes, shows card inserted but when I go to look at the contents via the LCD its empty
• if I plug it into my laptop while plugged into 12v my laptop shuts down
• if I plug it into my laptop without plugging it into 12v I can re-upload marlin
• tested with another ramps board I had as a spare and no change
• tested without lcd plugged in and attempted to connect laptop up again and no change (causes laptop to shut down)

the only constant things I have not changed are the Arduino Mega, Power Supply (shows 12v) and stepper drivers.

I ordered a replacement mega (two actually). I see no surface defects or areas where it looks like something shorted out...

am I correct in figuring that the Arduino if fried?

any way to replace on of the small smd chips and repair this one?

thanks