Searching and no service
First, please don’t tell me to drop the phone. Impacts cause more problems eventually, and I want to repair the phone permanently.
My phone has had this problem for months now. The difference with mine compared to many which have fixes shown on here and YouTube is that dialling *#06# does show the IMEI and no IDs are missing in settings>about.
I can get it working by heating the logic board. It will then work for a few days each time until reverting back to ‘searching’.
The baseband IC has been reballed along with one of the amplifier ICs but again it works for a few days probably due to the heat used during repair, then goes back to searching.
I’ve replaced the dock connector and the antenna at the top of the phone which has four connectors on it. Few days later it’s back to searching.
Heat curing it implies a fractured solder ball or other bad connection, I suppose. Is it something anyone has come across before (with IMEI present, etc)?
I should mention that after the last time I got it working for a few days, it failed like this:
Directly after getting it working again, full signal and automatically connecting rapidly to known WiFi networks when I was within range, 4G was working well and fast.
Couple of days later, connecting to 4G but couldn’t get to websites or send iMessages or otherwise send or receive data, and I had to open settings>WiFi before it’d suddenly connect to a known network within range.
Couple of days after that, no 4G but showing normal signal connection.
Day after that not showing any signal at all, can only connect to WiFi by going to settings>WiFi. It doesn’t connect automatically most of the time. Phone is now an iPod.
None of the fixes shown on YouTube work. Is there an IC that needs reballing or might be internally damaged that I should look at?
Without a functional diagram of the logic board, I don’t know which ICs are involved in the cellular signal line so I don’t know where to start.
Help please! I need a working phone!