I have been using my FP3 for more than a year now and since about the time I installed /e/ (based on Android 9) I’ve had the issue that sometimes the screen doesn’t turn on anymore after it goes to sleep. Also, sudden restarts every few days at least and other glitches. At the time I assumed it was all /e/ and it is simply not very stable yet.
A few hours ago I have opened the FP3 for an unrelated reason (practiced a camera change) and after reassembling it it would react to the on/off button with a vibration, but the screen would stay dark. I have taken out the battery, the cards and even dis- and reassembled the display a few times. Nothing seemed to work. I have even tried screwing the display screws in with different amounts of force. When I screwed in barely, the display would at least show colorful noise.
I have then followed an idea from this thread and opened it up yet again (…) to clean the contacts connecting the display to the board. There were just ever so slight traces of something on there (residue from air moisture?), so I’m not sure if that did anything. After reassembling the screen stayed dark yet again. This time I had screwed in the display screws with a lot of force. So I went ahead and screwed them back maybe a quarter or half a rotation on all screws and on next boot I had a picture again!
To summarize: I’m not happy that the display needs such a small sweet spot when screwing it in to work correctly. Also I can’t believe Fairphone ships a screwdriver that’s almost more sharp at the back than in the front. When you have to take out and screw back in all 13 screws multiple times in a row the center of your hand will look like you just let a whole clowder of cats lick catnip off of it. Disappointed to see that FP3+ still packs the same screwdriver.