Charger not working

Hi,

The charger for my laptop stopped working while in use. I disconnected the charger and let it cool down for some time. i separated the cable end with the 3 pin plug. After 10 minutes i reconnected the cables and connected the charger to my laptop; the led light on the charger came back on. But, after a few seconds it went off again, after which it never worked.Following are my usage patterns and purchase date, in case that information will hep determine the cause. I have purchased my Laptop in December 2016. I use my laptop mostly on weekends, for 5-6 hours, with the charging on. I usually play high graphic games and designing softwares.

      So I have 2 questions; 1- Can I fix the charger myself, without having to open it. Like draining its residue power or something. 2- Is the charger covered under warranty and how long will the replacement process take.

Kindly help me find the quickest method as I have some urgent work pending.