Fairphone power loop (without battery) doesn’t happen.
I have no friend with a fairphone and neither would like to buy a bottom module if it’s not the problem.
My idea is to find out where the problem is with a tester / polimeter wich I can measure the power supply with and see if the problem is the battery or a not working power module. The only thing I need is the bottom module`s pinout with the correct Voltage / Current as well as the battery pins (where the phone takes from and gives power to the battery) so I can measure and compare.
Can anybody help?
I would appreciate a topic llink for my problem as well.
By the way, I just remember I have a spare bottom module whose microphone is broken. I’m in San Sebastián, Basque Country at the moment. In case you don’t live near me or near any of the Angels, I am able to post that module to you so you can test whether your phone charges.
I live in Jerez de la Frontera, Cádiz. A bit far from the Basque Country or Catalonia. But I could send my module to be tested anyway.
AlbertJP, I am willing to pay for your module shipping and back, of course, so I can test it on my phone.
Leo_theCrafter, Is it too much to ask if you could tell me the supposed voltage on the pinout?
Again, thanks both very much.
PS: I have been to San Sebastián many times. Beautiful City.
I just got reply from Fairphone support. They say it’s the bottom module.
I’m going to buy a new one. The “doesn’t loop” thing is very illuminating.
FYI The voltage measures I got from the bottom module were:
USB+ | USB-
2,7V | 2,1V
I don’t know for sure if 4,8V are enough for the phone and a loading battery but that’s all I have. I only hope the new bottom module will solve this problem. If not, i’m afraid I bought another programmed obsollescence gadget.
In order to charge you need a higher voltage from your charger than the battery’s own 3.8V. I think 4.8V should be sufficient.
However, you are measuring voltage on the data lines now. USB+ and USB- are data lines, not charging lines. You need the voltage between VBUS and GND.
If you’re measuring on USB+/USB- when connecting a charger, you are just measuring the resistor in the charger which indicates its capabilities. D+=2.8V and D-=2.0V (or close to that) means you have a 2A charger (which is nice).
(Source: https://en.wikipedia.org/wiki/USB_hardware#USB_Battery_Charging)