OMG, the same happened to my FP3+ today
I found it’s a not so rare problem and it’s called sudden death. I followed the advice in this thread
Hello Fairphone community,
I have a Fairphone 3+ that I have had a little over 3 years that seems to be ‘bricked’, i.e. is completely unresponsive, no screen coming up, no little charging light, and inability to reboot/kickstart. This happened this morning when the phone was off and in my pocket and after a night of fully charging.
The phone has had no changes to operating systems and nothing savvy done beyond downloads from the app store. Hardware wise I replaced the bottom module with a new …
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and it worked for me. I hope it will help you as well 