Hi
It sounds like you have a bad main board unfortunately
If you really wanted you could try and fault find the bad component with a Multimetre to you could replace the main board
Here’s a guide for getting the board out
[link|https://www.youtube.com/watch?v=NRnIeZqkAGs|https://www.youtube.com/watch?v=NRnIeZqkAGs|new_window=true]
If replacing this board doesn’t help it could be a issue with the Bluetooth board
Heres a guide for that too
[link|https://www.youtube.com/watch?v=YSLjEneZkM4|https://www.youtube.com/watch?v=YSLjEneZkM4|new_window=true]
Hopefully this helps
Any questions please ask
Thanks:-)