Hi Buddy,
Signal has a wide range field or area in diagnosing a network problem,it depends the situation on what happen to the phone,weather it was watered damage,drop off the ground or suddenly lost network.
Let's start with the Software Problem
* check your network settings if set to DUAL mode,it means you've 2G or 3G signal,if this mode is far away from your area or out of coverage,you will experience signal dropping, If you are not using 3G signal,better switch to GSM mode and it will stick the signal along your area.
For Hardware Problem
* Base on source and latest issues about signal problem is by replacing 2n2 capacitor,before reheating or removing some main parts like PA (Power Amplifier) and other IC,better focus on this capacitors,Here is a illustration and have a look were it is located
* For no access,change the upper part.
* For no network coverage, change the lower part.
For the meantime,just stick with this solution before doing hardware modification,If you have some questions,don't hesitate to reply,i will give more ideas regarding signal problem.
Thank you for visiting FixYa.
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