iPhone 4S working only on 3G
I have iphone 4s and last owner probably try to fix blue coil from antenna signal but make only more damage. So when I open the phone, there was missing Blue coil (L47_RF) and also C14_RF, C12_RF, C180_RF and C183_RF. So almost everything around blue coil. I bought new coil and 33pF caps for C14 and C12, solder them on place and I get strong stable signal.
PROBLEM: making and receiving calls is possible only if I have enabled 3G. If I turn OFF 3G I still have full signal, carrier name, IMEI and everything just look fine but no way to receive or make call.
It seems like it is working only on 3G network and this is 2100MHZ band. There still missing C180_RF and C183_RF, but I think this is not the reason of issue. Now I doubt on myself if I solder properly C14 and C12 - I check under the microscope and looks fine.
Any suggestion, idea?
Is this a good question?