@djose since you already replaced the charger and the battery I suggest that next you change the SUB PBA, also called the daughter board. That is the circuit board that has the charging port etc. mounted to it. Even so we do not have a guide for this, You can take a look at the teardown [guide|97071] and it should get you there.
If that should not work either, it's time to take a look at some of the board components. Use this flowchart for that
[image|2840956]
To find the components to check out, use this [document|28380] and utilize the search function of your PDF reader. i.e. the flowchart says check L7000, type that into the search function so that your reader will point to it.
If there are parts you are unfamiliar with or something looks odd etc., you can always post pictures with your QUESTION. Just do an edit of your question and use this guide [guide|21499] to add images.