I just fried 3 raspberry pi 3 b+ in a row and I do not understand what I do wrong. For the first 2 ones, I thought the pi fries because of a camera module I installed. However the 3rd one, I did not installed any camera. The power supply are good - all 3 of them was specific to the pi. The 5v dc pin showing 5 volt on the multimeter. The 3 volt pin at first show 3 volt pin and 0 volt after a reboot.
The power supply is plug-in a smart power bar. I was closing the pi by powering off the power bar via my smart phone. Could that be the problem? and what his wrong by doing it that way? I have a 4th ordered that will be used with Octoprint. I really need to understand what his wrong with my setup?
Do anyone understand the problem?
note: I tested the pin with a multimeter touching the pin 1 (3 volt) and a ground pin (last one) - and pin 2, 5 volt and a ground pin last one. The 3 read 0 volt and the 5 volt is OK.