I have no idea where exactly the problem lies
There are some troubleshooting steps in this thread: FP2 Won't turn on or charge - See first post for troubleshooting
I recieved the following troubleshooting guide from the support, maybe you will get a reaction when following those steps. If not, you probably have to contact the support too. Maybe call to tell them that you already followed a troubleshooting guide for a quick response and include the results of all the steps in the request.
We are sorry to hear you experience problems charging/starting your Fairphone 2. This can have a few different causes and we would like your help diagnosing the correct one.
No matter what the issue is, please make sure your phone is up to date to ensure you are running the latest software, including all the relevant patches and security fixes.
Step 1: try out different chargers
The first thing we’d like you to try is to test a different charger and USB cable. We have noticed that very often charging problems come from a defective cable or defective charger, or chargers that are not strong enough. For more information on the specs of a good charger, please consult our support article How can I charge my Fairphone 2?.
If the charging doesn’t work with a different charger and USB cable please try to connect your phone with a USB cable to the computer. When it is set to charging it should automatically start to charge. If this is the case the chargers and/or cables you tested are not good and need to be replaced.
You do not have to reply to this mail and go any further with other steps. You can get a charger at a local store.
If the device is still not charging, please proceed to step 2.
Step 2: diagnose the issue
Remove the battery and connect the device to the charger. It can now happen that your phone enters a boot loop.
Scenario # 1 - The device enters a boot-loop
Each cycle of the loop will follow this pattern:
the Fairphone logo appears on the screen;
the display turns off and the LED on the top left corner shortly blinks red;
the phone vibrates;
If your device enters a boot-loop, your battery needs to be replaced:
If your battery was purchased more than a year ago, the warranty on it has expired and the cause of the issue is probably normal wear and tear of the battery. In our online store you can order a brand new FP2 battery.
If your battery was purchased less than a year ago reply to this e-mail to let us know. Please make sure that we have either your original order number, or a copy of your proof of purchase.
Scenario # 2 - The device does not react at all
If the phone does not react to the charger being plugged in (the display stays black, the LED doesn’t light up and the phone does not vibrate), please proceed to step 3.
Step 3: remove and reinstall the bottom module
Remove the module and reinstall it. Check out this iFixit guide on how to do so. All you need is a Philips # 0 screwdriver.
Once you remove the module, we’d like you to take some pictures. We might ask you to send them to us at a later stage:
The back of the module
The front of the module
You can then reinstall the module inside the phone. Before installing the display, please take some extra pictures:
The inside of the phone
The side of the phone with the IMEI1 and IMEI2
Now complete the assembly, turn on the phone and test it out performing steps 1 and 2.
If the issue has been resolved, you don’t need to write us back.
If the issue persists, please write us back and let us know which of the scenarios applies to you. We will help you further.