I got my Raspberry Pi Zero in the mail Tuesday, and I was of course very happy ;). It worked fine with my phone charger (Sony, 2A max), although I couldn’t get the UART to work. I had already soldered on the GPIO header.
Today, I got in some 7805 chips I ordered and I used them to build power modules as described here. I got out my multimeter of course and it was supplying a happy 4,8V. Not as close to the 5V as I’d like it to be, but good enough. I then stripped down a micro-USB cable, soldered it to the module and plugged it into my Pi Zero, after having checked again that the module was still working. Then nothing happened, nothing at all. The LED didn’t turn on, there was no smoke, nothing. I unplugged immediately, but it was too late: the Pi doesn’t work anymore, not even with my phone charger. However, since the B+ has much more power safety onboard, I thought I’d try my module on it: it worked flawlessly!
I could apply for warranty, but the shipping costs back to Great Britain will be the same, if not more, than the amount I would receive :(. So at the moment my question is: why did this happen? I don’t want to fry a second Zero when I get my hands on one.
If it’s any help: the Zero’s 3.3V pin puts out 2.3V now, and the board get’s quite warm near the power-in port and the SD-card slot, which is now empty.
Thanks in advance for all the help!