Based on some of my previous testing I’ve found that chargers that provide less than 5.0V under load, even just 0.1V under can be enough for the Fairphone’s screen to stop working, and over a longer period of time potentially cause battery problems.
Extra resistance in the USB cable, or a low quality charger can be enough to cause the issue.
Try a different charger, preferably one that delivers 1 A current.
I had that problem with a charger delivering 0.75 A after I encrypted my phone … using other chargers delivering 0.8 A and 1 A solved that for me, the touchscreen worked fine again while charging.
@luy I closed your other thread as the original issue is solved. Please continue here if @AnotherElk’s tip above doesn’t solve your new issue.
Now I have tried another charger with 1A and it goes perfectly
Dear Fairfone,
My screens freezes most of the time during charging. Can this problem be solved in some sort of way? It’s getting really annoing. 
Please try a different charger. Make sure it outputs at least about 1.0 A (1000 mA).
Here is a list of working ones.
I had this problem with a 750 mA charger after encrypting my phone, 800 mA and 1000 mA chargers solved this.
P.S.: This is a community forum. Fairphone employees might drop by occasionally, but if you want to contact official Fairphone support, here’s a link.
Ah yeah, tnx for your answer . I have a charger with an output of 1.0 A, so maybe there is something else that might help.
I’d try another charger. I have several chargers which output more than 1A, which have the problem, and the issue is that under load they are not outputting a full 5V, it’ll drop a little under to 4.9V or in more extreme cases 4.7V which causes the the screen issue.
Just for the record, I am affected by this as well. The same charger works fine with a several other smartphones, like a Sony Xperia Z5C, which is quite new and came with another charger.
It also happens when connecting the Phone to my PC, which I do regularly with other phones as well, and that is a deal breaker for doing developed with the phone.
The problem of not being able to use the phone during charging might be related to a two-wired cable. Try a four-wired cable (one that can be used for data transfer).
@ben what’s the output current of your chargers? (PCs usually only output 500mAh, for example.)
@Stefan thanks for your suggestions. I have checked the chargers, one of the chargers seems older, 850mAh.
I have no idea what the PC outputs, but I never had such problems with another phone. The cable is definitely a quality cable which can be used for data as well. I use it do quick charge my Sony and for development every day.
I will either get my bottom module replaced due to a faulty mic or buy a new one, I will check if that improves the situation.
Yep same here… (of course as I’m having all possible problems with my phone) 
Odd thing here is for me, that I never observed this kind of behavior, that the touch screen is completely nonfunctional for me when on charger before like say one or two months worth of monthly android (6) updates. Or say maybe when fairphone2 switched over to android6.
so it was only recently that i noticed that I can not use the fone any more when being on charging. I dont have that many cables or different chargers, so I think i could swear that it used to work before with my scenario and setup here. Well anyways, today I finally decided to look around here on the forums and found this and some threads about screen and charging.
Weird. But thanks anways.
Yep this does seem to work although I find it better closer to the phone end rather than the charger.
Also on most charger cables it is rather difficult to pass the cable through twice.
Hello.
I have never had this kind of issue either with my old Samsung, Huawei, Xiaomi Pad or Lenovo Pad… No matter with which charger I plug in, no matter I’m connected to the ground or not…
What’s wrong with the FairPhone 2 ? Why is it so sensitive to this touchscreen issue ?
I even have the problem when I plug a jack to listen to music with speakers connected to earth !
Chargers are everywhere nowadays. In the cars, in the airports, in the shopping malls, or even modern powerplugs in the house. I thought the FP2 was supposed to be universal, the reason why they don’t even provide a charger with it ? An since it has such a weak authonomy, I often need to charge it during day time, with the powersource I find nearby.
When I close the screen and open it again, it works for a few seconds then again and again …
That’s really annoying. Any real solution so far ?
These so called “ferrite sleeves” (there are more expressions for them) are also available as clip on version.
They may help in some cases, but not in all.
For info, ferrite loops didn’t help in my case. And I just discovered that a charger that worked in one Fairphone 2 didn’t work in another Fairphone 2, and vice-versa. Match between a particular charger and the charging module unfortunately can be whimsical.
That´s quite interesting to know. Someone who was successful to match a charger with his actual FP2 may be surprised when he uses it on another FP2. Several users stumbled over this screen issue already when charging.
This problem should be fixed with the next FP version. It´s essential specifically since there is no charger shipped with the phone.
Up to now I think it´s not clear if it´s a display issue or a bottom-module issue showing up with display problems when charging.
If it was a display issue it would be interesting to know if users with a replaced display could experience any difference with this effect.
Anyway FP should address this with any new step in hardware modification.
I had to replace my screen and I didn’t experience the issue since… But I’m curious if it’s just luck (my old charger and the new screen are compatible) or rather a fix (my new screen is compatible with all chargers).
This has definitely been fixed with the new “C2” display modules available since late 2017. There are many reports about that here on the forum. Fairphone just never confirmed this officially (as far as I know). Maybe they’re worried that too many people would make a warranty claim for a new display module if they did?
I’ve been effected by this as well and eventually just bought a new display module. That fixed it once and for all.