To make a custom board on 40pin header, I tested drawing
20 mA from pin 2/4 of J12, 40 pin header. I connected 220 ohm
between pin 2/4 and 6 and measured the voltage between
those two pins. It was around 2 V, not 5 V. How can I use
5V pins of J12 correctly?
I mentioned about power pins, not signal pins. I have both Nano
and Xavier NX. Nano 5V power pin (2/4 pin) can be drawn more
than 20 mA, but 5V power pins of NX cannot supply enough current.
3.3V power pins of NX are OK.
I tested Q23. When 200 ohm is connected between pin 4 (5 V pwr) and pin 6 (GND), Q23 drain is 5.11 V, source is 1.99 V and gate is 0.00 V.
Is this data enough?
Also could you send a picture of the rework so as to check how 220ohm was soldered? As it is very strange. Q23 is a P-FET so if its gate is at 0V and drain is 5.11V, then source should be also at 5.11V and not 1.99V.
I can’t rework Q23. Q24 because it is too close to the connector J12.
I don’t solder 220 ohm, only connect a resister between pin 2 and pin 6 of J12 using jump wires.
I borrow another Jetson Xavier NX from my colleague.
It works fine. It can draw more than 100 mA from pin 2 of J12.
It seems my board have some problem.