I think my warranty is finished. Now, I'm trying to fix it myself. I think it's the battery. Do you know any trick that I can apply to open the case to change the battery? Thanks.
Hi @Bhupinder. :robothappy:
Presuming that you've tried to boot the phone up when it's connected to a computer (and tried other cables) and it's still not working, then as John4Oh says it's best to get it checked out by some official peeps (you'll be able to find your nearest walk-in Support Centre using this link).
As for advice on how to do a DIY fix on it, the official Samsung forum probably isn't the best place for that kind of thing, and I'm unable to endorse/recommend any of the DIY guides that are out there on the web.