Hi !
The power button of one FP3 is dead. The physical switches in the frame of the phone are working (verified using a multimeter). Neither ultrasonic cleaning nor oven “reflow” solve this issue.
Does anyone have a wiring diagram for searching for any broken wires ?
Greetings
Fairphone didn’t publish schematics for the Fairphone 3/3+, supposedly for legal reasons.
Apparently the situation could only be resolved or taken into account for the later designs, so that schematics are available for Fairphones 4 and 5.
Maybe an micro-electronic expert can help. I think, that one of the tracks is broken on the mainboard or a faulty resistor/capacitor. The FP3 ist fully functional - except the power button.
The power button is on an extra subboard that was not sold by FP itself, but it can be bought in the market:
The subboard isn’t the problem. As I mentioned above, the subboard is working fine (verified by a multimeter). The poblem must be a broken track on the mainboard or a faulty resistor/capacitor in the conection to the power management. But without wiring scheme a repair isn’t possible.
Hey there,
I have the same problem. The frame and the physical buttons definitely work (tested with another mainboard). I also measured the resistance from the on pin of the board to the neighboring components and couldn’t see a difference to another board.
@FPbonn does your mainboard show any abnormalities? Mine has some of the PCB scratched off at the left whole next to the battery connector (see picture). Could that have any impact?
Kind regards
I do not have that mainboard anymore. The drilling could be the reason for that behavior, because the board consists of multiple layers.
