Try the emergency reset hole.
Mine wasn't charging either so I tested Lenovo's suggestion by pressing down on the reset hole button for 10 seconds with a paper clip. Charging light came on after holding the reset hole button down for about 10 seconds.
T490's reset hole is number 3, it's above the screw on the left-middle on the bottom
[image|3573896]
Link to Lenovo instruction page:
[link|https://download.lenovo.com/pccbbs/pubs/t590_p53s/html_en/en/Bottom_(topic)_T0000698311.html|Lenovo T490 and P43s]