I was doing some set up testing on the Arduino Mega 2560 with an LCD board on top. I hooked up the VDD wire, which is the next to the bottom pin on the right, to the 5 Volt pin socket on the LCD. It ran fine the first few times but between tests, the VDD wire came off.
I had the VMOT, at 12 volts, off when I hooked it back up. When I did, the LCD shut down. The display stopped right away but it took about 5 seconds for the back lighting to go dark. When I pulled to wire back out, the display came back on and was apparently un-harmed. I plugged it in and pulled it out over and over and got the same shut down response and recovery.
Then I decided to plug the VDD wire into the 5 volt socket at the end of the Arduino board next to pin 22. I got the same issue and I can’t figure out what is going on? Of course the motor won’t work with the VDD wire in or out.
What can I do to fix this?