Looks like my SGS2 started to have mobile connectivity/GPS problems, possibly as a result of DIY repair (I manually replaced LCD+digitizer after an LCD damage):
- GSM signal level frequently drops to nearly zero
- mobile data speed drops to (nearly) zero
- GPS works only rarely; can't fix most of the time
How can I debug the problem? Which connectors etc to check most carefully which can directly affect the problem? What else to try?
Official firmware auto-updated to 4.1.2. GT-I9100. GSM, non-locked, international version.