Switch wont fast charge

Nintendo Questions Nintendo Switch
1

A while back my switch stopped charging and it’s only recently that I’ve been doing some testing on it to try and figure out why, I believe my switch charger was broken and maybe that’s what caused the problem to begin with.

The switch is charging on a 5v 2a USB A-C fine, but it refuses to take PD charging, it won’t even charge with an A-C cable after the PD cable is plugged in until it’s put to sleep and woke up again.

I did some testing based on diagrams I saw on this site and others and have found that the horizontal capacitor above the m92t36 on the right side should give 562mV but it is giving 16mV, also the cc1 is giving 22mV instead of 491mV like cc2.

www.tronicsfixforum . com/t/m92t36-replaced-still-short-on-vconn-in/2898

The image in this post above (I can’t post images or links because my account is new I guess.) is the one that’s giving me 22mV.

Does anybody know which part I need to change to fix this? Is it the m92 or should I test something else? I’m lost trying to figure it out.

2

First check your USB-C port itself, if any damage that is your starting point.

If there are no corrosion or bent pins, then It sounds like the M9 chip is faulty. The quick and dirty way to tell usually is continuity mode on your meter. If you ground on both sides of the caps north and east of M92, then it’s bad.

The bigger western cap is for PI13, but that has nothing to do with the charging system at all.

BQ [IC nearest between USB-C port and battery] I don’t think your battery would get charged but check the caps around that as well.