It will swing back to 5V, then renegotiate 20V, then repeat the loop forever.....

My T14's (NM-C801) main USBC input keeps failing every few months. Initially, it worked fine for several years. The symptom is that once powered from the main USBC port using a 65W power brick, after some time (minutes, hours) charging will fail completely. Powering from the secondary (docking) USBC input still works. This laptop is basically always plugged in. The first time it happened, it took me a long time to find that the FPF2281 over-voltage IC for that USBC input was at fault. When the issue occurs, it will continuously reset power delivery negotiations with the power brick -- according...

I found the nm-c801 schematic on this site already (thanks!), but can't find the boardview anywhere online, except on super-dodgy for-pay websites. Anyone has this lying around?