How to change my down board

@eviplli just in case you are referring to the charging board :-)

Since iFixit does not yet have a specific guide for this, use something like this video to work on your phone. You do not need to remove the main board. Make sure that your issues are coming from the charging board. The A series has issues with the flex cables coming from the charging board to the main board. Check that for micro tears and corrosion and proper connection to the boards.

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 a device with the same issues 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 on Entropy!