I have a Nintendo Switch HAC-CPU-20 motherboard that does not indicate it is charging on screen and does not power on. USB C tester shows roughly 15.25 volts , 0.484 amps, at 7.43 watts with battery connected. Checked the C port under a microscope and nothing looks out of place.Tested for voltage at the coil between USB C port and Battery connector and get 4 volts. I then also tested the connector itself and get 4 volts. Probed caps around m92 and am not finding any shorts. Have watched a handful of “diagnostic” videos of different things to check and am not finding anything that indicates any shorts anywhere on board. This is my first time trying to diagnose a Switch so am pretty green when it comes to these consoles. Trying to get a better idea of what I can test to try and figure this thing out so any tips tricks or other knowledge that can be offered, it would be much appreciated.
Do you have a break out board to measure the good connectivity of your USB port pads? Always start by measuring the USB port.
That is probably the one tool I do not have (aside from a thermal camera), but I did order a Mechanic t824 so that will be here hopefully by the end of next week. I do not believe it is a usb c issue at this point. it charges both ways, the dock recognizes it for a split second by showing the green LED (but still no display) and I have the proper voltage at all the points needed. I do have a questionable reading on a single capacitor underneath the CPU but am waiting to get another known working switch opened up to check readings on that one before I go ahead and remove it and probe again.
Figured I would drop a comment to say I have figured out the issue and it seems to be a dead emmc. One of the switch systems I installed a mod chip into gives me a blink code stating emmc initialization has failed. Checked a second donor emmc and it boots without issue into hekate.
Have you tried a Nand rebuild with NandFixPro, it works in many situations! Look at some tutorials on Youtube.