i have the same problem but I just solved it.
So, i want to share it maybe someone is looking for a solution. Here was what I did.
1. open the phone housing/casing and you will see the circuit/battery etc. remove any salotape if any to see it clearly.
2. find the battery cable(red/black) which connected to the circuit/board. Disconnect it for a while, may be for 8 second. if not work may be try again for longer period.
3. after that, reconnect the wire back to its place.
4. connect a charger and see if that works.
