After studying RPi's USB power schematic, I understand that I have been respecting the test points TP1, TP2 too high than they deserve. I now know that these testing points are perhaps only for testing in product assembly and testing stage. For users, the P1 connector's pins are actually the same thing, and more assessible.
So from now on I think I can just forget the TPx thing and use P1 pins instead.
.END
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