The Power Jack is the only power input port. All power pins at other ports are output.
How to make T4(1802) start automatically when power is plugged in
For more details refer to Schematics
Clicking on the hot link in wiki brings up a page in chinese, translate to english in chrome gives directions how to modify the board to power on when power is attached without pressing power button. I can't solder that well and would not try it and don't have a need anyway. But if you really need it it is possible.
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