Yeah, that was my first thought as well, it might not be an "official" Lenovo charger. In practice, I've found Thinkpads to be quite forgiving, but the most recent one I've owned was an X240 so that was a while back.

I second the suggestion about the jack being bad. I'm not sure how modular this particular Thinkpad is vs the old ones, but in the past it was relatively trivial to pop the keyboard off and swap the jack out - at least that's how it was on the W520 I had years ago.


I work here