Resolving Samsung Galaxy S1 Function Button Problem
When it comes to Samsung Galaxy S1 function button problem, one thing is for sure that there is no possible software solution, as the only method to resolve this is the hardware method. I am sure that you have already tried every possible software solution to get this thing done like giving a hard restart to your Samsung Galaxy S1, Tapping it to your palm etc.
Hardware Solution for Samsung Galaxy S1 Function Button Problem
After disassembling your Samsung Galaxy S1, the next thing that you need to do is to make sure that Function button controller is connected with the bottom board. Now all you have to do is to reheat function button controller, as this thing is surely going to solve your function button problem and it will start working again.