If your laptop is discharging when plugged in to the charger, it may be a sign of a faulty battery and need to be replaced. However, you must make sure the charger is not damaged itself - if you can continue to use your laptop even if the battery is fully discharged or removed, then the charger is working properly. Otherwise, it must be replaced.
As you've specified that the PL202 inductor is damaged, I invite you to contact Lenovo to explain them that you're encountering a charging problem after the damage of the component. They should provide you the assistance needed to fix your laptop.