My FP3 (out of warranty) suddenly shut down a few days ago, with a battery half full. It kind of booted once for a few seconds, but now it shows no response whatsoever.
The LED does not light up when plugging the power adapter. I tested several adapters without success.
I disassembled the phone and reassembled it, no change. The bottom module has been changed a few months ago. I have little hope, I suspect a failure on the motherboard.
I just need your help figuring the voltage that I measured:
3.85 V on the battery. Is that consistent with a batter level of around 50%?
when I plug the power adapter and remove the battery, I read only 1.6V on the pins showed on the picture attached. Shouldn’t I read 5V?
I doubt that the phone will work without battery. This has been discussed on the forum before.
So what those pins output is likely not representative of the value with the battery connected. Also, 5V would be too much as a charging voltage for the battery. More likely somewhere around 4.2 - 4.4V max.
Or maybe I misunderstood. What exactly are you trying to determine with your measurement?
I was trying to see if there is the correct voltage applied to the battery while charging. But I don’t have access to the pins with the battery plugged in, so I tried without.
I guess you’re right, the behavior is different without the battery.
I think I will disassemble and clean all the contacts one last time, but after that it seems hopeless.
Thank you to everyone for their insight.
As it looks like the Core Module is the cause, i’m not sure I’ll send it to repair . Considering the cost of repair, maybe I’ll buy a second hand one instead, so I’ll still have the spare parts from the current one.