Hi and welcome to the forum and I’ve just changed the category you posted in.
If you search the forum you will find many such posts.
For example:
You can remove the bottom module and check it’s contacts are clean
If you do not have a warranty
- then removing and cleaning the contacts is always a good step,
- as well as cleaning the USB port
- You can also breakdown the bottom module to better clean it.
FP3 Bottom & Top module breakdown
Please read a lot more and post back what you have tried.
Removing the bottom module requires removing the display module where you have access to it’s contacts and can check for
[red square]
[red solder] etc.
The two links above are just odd posts from FP3 charging topics