So i am using an arduino clone gizDuino. Im connecting it to a lcd module. I successfully connected all the pins in the diagram, but when I connect it to the microcontroller the backlight doesnt power up. so I tried a 7.4v battery connected to the VIN of gizduino and one to the ground. It worked proplerly. I got the lcd module working(but without battery its not working). Then all set up and im ready to go to present my project but suddenly the gizduino doesnt power on when I placed the battery. I dont know what happened, I thought my board had a short circuit but when I connect it to the computer it seems working fine. Is anyone experienced this before to their microcontroller. PLS help.
NOTE: I haven't noticed any burn or smokes when I hooked up the battery