New OPi Zero - Yet another high temperature issue...
My third Orange Pi Zero came last week, yesterday I plugged it and had heating issues... So I started reading, learning and testing....
Setup:
OPiZ-1: 256 MB, no SPI flash - Has extension board plugged - for comparison
OPiZ-2: 512 MB, with SPI flash
OPiZ-3: 256 MB, with SPI flash (new one with problem)
Test conditions:
All with (newish) Sandisk Ultra 16 GB Class 10
All new formatted (SD Formatter) and burned/validated (Etcher v1.0.0) with
OK, will do... They are disconnected now...
I examined the boards. Old ones are v1.1 the new ones are v1.4... Also the layout (and circuitry) did change !
It seems that (if I'm not mistaken) in VCCIO 3.3V/1A circuitry Q11 is gone and there are changes in U55, U7, U4 voltage regulators...
Attached images of related portions.
v1.1 boards
v1.4 board (problematic one)