You could try a kickstart to reset the software of the battery.
Did you check, if it makes a difference between the 2 possible positions of the USB-C plug ? If the bottom module is broken, it charges often only in one position. Also a non working ADB can result from a defective bottom module.
ADB device works on both sides of the USB-C.
It just doesnt seem to charge (no LED, battery drains extremely quickly (1% per second, it went from 50% to 4%, now it seems to be stuck).
Going to try a kickstart without much choice atm
Anything I should do beforehand?
Is there anything I can do to prove that the mainboard is truly defective? Anything I should absolutely avoid doing assuming that it’s the case?
Should I order new parts? a new phone?
Edit: the battery is now stuck on 5%
Thanks in advance
I would not point that fast to the core module actually.
Which battery did you test, both? Did you test different cable? Did you clean the USB Port? Maybe its just the USB Port. Maybe there is an angle close who can help you to test modules. angelsmap
I had a similar issue with the old battery but it could also be reflective of its actual power level (old battery that I kept under wraps for months)… I could try with the old one, who knows?
I tried using different cables, but that didn’t work.
I havent tried cleaning the USB port, but it wouldnt be my first guess considering ADB works fine (and the USB-related notifications show up on my phone).
I’ll look into it, thanks.
Is a kickstart worth trying? Anything I should avoid doing?
Thanks 
I would say yes its always worth it to try to reset/kickstart the battery, just have all backed-up in case the battery will not charge again…
figured as much.
I’ll let the battery charge overnight (for real this time). and i’ll try to do backups ASAP (probably tomorrow or the day after)
I’m starting to question if it’s even worth turning the phone off… 
Edit: I’ll check the rest of the thread tomorrow
What you can do is replacing the bottom module. But use a brand new one and not a used part.
A broken bottom module can have a deep impact on the behavior of the phone.
As I mentioned e.g. in the german post:
- Only use USB-C cable of top brands (e.g. Anker)
- Change Bottom-Module (19,95 € is not too expensiv, if it might not the solution)
- Check cable connectors between modules and mainboard
- If all above not helps: You Mainboard ist broken
Update: I let my phone charge overnight while on and it lost power (went from 5% to 1%), although that last remaining percent seemed to last much longer (easily several minutes) than I had anticipated (?)
So I was in the middle of backing up my data when the battery died, so I tried a kickstart following Lidwien’s method (#1) and I got the following results:
- When plugged directly into a power outlet, it seems to be stuck in a bootloop? (loops as previously described…) and when I took it out, the phone tried booting completely (started the LineageOS animation and then died, presumably out of power)
- When plugged into a USB device (ie my PC), it still loops but the loops are more spaced out.
I’m confused…
I’ll let it charge as much as possible while powered and try to finish the backup ASAP, and then I’ll figure things out.
I’m in the process of buying a bottom module and a good cable+charger. And let’s hope the data isnt corrupted…
If you are lucky there is a Fairphone Angel in your neighbourhood and the Angel has a bottom module and battery for a Fairphone 3 to test your phone.
Sadly, it seems there are no Angels near me 
I bought a bottom module. Let’s hope that works.
The phone wont charge anymore, all I get when I plug it in is the LED blinking red (no “bootloop”), and I can’t get it to boot.
I’m hoping it’s just the bottom module 
Otherwise I’ll have to figure out a way to make a copy of the data >.>
I should get the module in about a week, I’ll let you know then.
Thanks for all the help
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hey
I got the module today and I am now facing a new problem.
One of the screws holding the display module cannot be unscrewed. It looks like the screw pitch is damaged (probably my fault >.< ;-; )
For now, I’m putting things on hold until I can clear my mind. Anything I can do at this point? Should I go to a professional?
Thanks in advance
Edit: it’s getting late here, so I’ll look at the replies tomorrow
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In the worst case: There are left hand drills available. If try a “normal” right hand drill, you may damage the thread in the display.
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Thanks for the replies. I’ve tried the “easy” fixes, the screw won’t move and I don’t have a left hand drill on hand.
Tbh I don’t want to damage the screw any further, so I think I’ll take it to a repair shop (sadly)
I’ll keep you posted!
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Hey,
So changing the bottom module didnt help.
I guess I should follow @FPbonn’s advice and try to clean the mainboard with IPA.
Is there any way I can try to backup the data beforehand?
To summarise the situation:
My FP3 won’t charge and therefore won’t boot, the battery drained quickly before I could do a full backup. The bottom module was changed and that didnt help. I also got a brand new charger.
I still have an old battery lying around but I wanna keep it as a last resort…
I’m wondering if it’s possible to change the mainboard (if I buy a second-hand FP3 or 3+)… Has anyone tried it?
Wouldn’t it be easier to use the second-hand phone as it is? The mainboard is basically the phone itself, at least the biggest and most expensive part.