I simplified my setup right back to the basics.
I have a RPi3, Zero Lipo soldered on. That’s it for now.
Running it headless. I plug in a 500ma lipo battery, fully charged via adafruits mini charger. Checked the batteries out put and it’s a shade over 3.7v.
The zero lipo lights up blue LED, and flashes red led. So it has good voltage, but I believe it’s warning that battery is running low?
The RPi 3 will not boot. Just a green flashing LED on RPi. No red LED. I measured across pins for 5v and ground, but only see 3.6v.
So question is… Have I fried the zero lipo when soldering the board on?
What can I check…
Or… I dunno is there a jumper to allow back powering or something?
Sorry note it works fine from normal USB power to the RPi. N