Still not charging after battery replacement

I have a Charge 2+ that wasn’t charging (red battery light). I opened it up and found the old battery shape like a football - not good. I bought the correct polarity replacement and voila! I had a working speaker for a while. But, it is still not charging. This could be because of a faulty USB port - but from the looks of things its in perfect shape - no corrosion/damage. What can I do to test it? The small circuit board that has the micro USB charging port as well as the USB out and the headphone out is connected to the mainboard by a 32 pin ribbon connector and I’ve got no idea which of them carry the power from the charging port. Any ideas how I could figure it out? Is there a circuit diagram available for the Charge 2+?