iPAD Pro ONLY charges (slowly) when plugged into a computer
I've tried all different cables and charging blocks and it will not charge when plugged into a power outlet. It will charge (very slowly) via a cable plugged into a PC or laptop. It does show the 'Not charging' message, but it does charge slowly. I have tried all of the simple things like cleaning out the charging port (several times), restarting, hard rebooting and even resetting and restoring the iPad. This is a A1584 (first gen). Doesn't seem to be a battery or port problem, since it does still charge. Could this be a chip problem?
Any suggestions or recommendations would be much appreciated.
iPad Pro 12.9-inch Wi-Fi