This could be the DC-IN board, but more than likely this is a board-level problem. You could try replacing the DC-IN board if you’ve ruled out the power adapter already with an Apple branded, known-good charger. If this does not solve the issue you will need to further troubleshoot.
You will need a schematic and boardview file for your logic board. These can be found by Googling. You will also need a multimeter and likely a soldering iron or hot air station to repair this.
On page 51 of the schematic you will find the SYS_ONEWIRE circuit diagram. This is where you should begin troubleshooting. You should probably watch some of Louis Rossmann’s YouTube videos on the SYS_ONEWIRE circuit before attempting to repair this if you are not experienced with troubleshooting at this level.
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