A week after an accident with water, my fairphone 4 has started bootlooping. After extensive drying it would work normally at first, but start bootlooping after some time. After doing this a few time it is now constantly bootlooping. The problem seems to be coming from the power button, which is always pressed.
By dissassembling part of the phone, i can separate the button contacts from the mainboard and avoid this behaviour. Touching the two bottom contact on the mainboard triggers power button behaviour, so i think the mainboard is mostly fine. But using a multimeter on the two bottom contacts on the frame read ~3kΩ instead of Open Loop like the volume buttons contacts (pressing reads ~1Ω for all of them). I concluded that there must be a short Somewhere in the frame, constently triggering the power button signals.
Unfortunately extensive drying, scrubbing and flushing with isopropyl alcohol hasn’t helped. I can’t see anything that would explain this, and i’m not sure i understand the delayed appearance of this problem. I have used a piece of paper on the bottom contact to prevent contact between the frame and the mainboard to use the phone mostly normally, and noticed that the fingerprint reader is also not working.
Does anyone has any idea how to fix this? Sending it to the repair center for such a simple component seems overkill (and pricey) so i would like to try a few thing myself before that.
