Iphone 5s water damge no service solution

Hi guys i have iphone 5s water damage when i insert sim card it start searching and after that shows no service i have been did several things but same problem so any expert can help what to do more resolve this solution regards
1: I have wash pcb with alcohol and
2: Change signal antenna and
3: And also changed antenna wire behind pcb but same problem
imei and firmware is showing on iphone description so please requested to expertise help to how to sort this issue regards