My phone is not connecting to charger

@tamimsafai could be a bad battery, bad charging circuit or a bad charging port. The easiest is to actually replace the charging board. It is relatively inexpensive and replacing it is fairly straightforward. Also, check the flex cable from the charging board (sub_board) to the main board for any tears, corrosion etc. Once you have the board replaced, I would also replace the battery, since you have the phone open. That way you only have to do that one time.

Since iFixit does not yet have a guide for that, use something like this video to replace the parts.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War one Entropy