got a strange one here. Switch boots fine and shows charging icon (original nintendo charger) however it actally doesn’t charge and the percentage creeps down when the switch is power on. Switch draws 15V 0.05A. When you put the charger into the USB it doesn’t boot and you need to manually press the On button.
I’ve checked all the caps, replaced the BQ, Fuel guage, M92 and still the same. the problem seems to be that I have 1.2VDC (in Diode mode) and 420K Ohm (I think 420K is ok?) on pins 1 & 24 of the BQ. tracing it back and removing components it only disappears when I remove the M92. I’ve tried a couple of M92’s (all pins on the M92 show as in spec in diode mode). Nothing is showing hot in a thermal camera and I’m thinking that something is dragging the M92 down when it comes to pins 1 & 24 on the BQ.
USB C has been swapped as well and a breakout board shows the pins in continuity to the right places. This one has got me scratching my head.
Also Pins 4 & 6 on the M92 show 0.9 & 0.2VDC and swap over when the charger is switched around but it still doesn’t boot unless I press the power button. Also tried different batteries and still the same.