Greetings from Brisbane, Australia…
So the background to this is… got a Switch that had water damage so wasn’t turning on, I can’t recall what the voltage and amps was before I opened it. There was a bit of corrosion but not a huge amount. Cleaned the boards/connecters with IPA, nice and clean, tested the chips and caps and no continuity issues. Put it all back together and tested it, still not turning on, power reading was 5v 46amps.
Pulled it apart and cleaned it a few more times but same result. Then I saw one of Steves videos where he had the 8 switches, liquid damage and and similar power readings. He tested the CPU and was getting continuity issues. I tested the same and I seem to have the exact same issues, that is if I have black probe on the USB port and red on the caps, if I put red probe on USB port and black on caps then no continuity issue, is this normal?
Now I have seen somewhere that sometimes these caps under the CPU can test as shorted but are not really and therefore do a diode test which I did and it comes back as around 0.04.
What is also confusing me is that sometimes my PC is recognising the Switch, it will come up as unknown APX device, used ZADiag to install the driver and then used TegraRCMGUI to be able to install a payload and it did it successfully! Is this possible if the CPU is shorted?