He scrolled to the charging circuit. The schematic pointed him to a tiny chip, PUB1 . This was the "Governor" of power. If this chip didn't feel "safe," it wouldn't send the signal to let the 19 volts through.He checked a tiny resistor nearby, PRB3 . On the schematic, it was rated at 10 Ohms. On the board? It was blown wide open—a microscopic crater in the silicon landscape.