回答“My Nikon J1 wont turn on.”I have the same problem with the J1. Battery is good, conatcts are good still won’t turn on. Most likely the power board (the PCB on the top) has an issue. I have already measured the Zener diode at the power input and the fuse. Unfortunately I could not find any schematics for further troubleshooting so I think I will replace the whole power board if I can find one at a good price. If I wanted to have it fixed by Nikon I would need to send it abroad as they don’t have any repair center in my country.