Normally, this is an easy repair as long as there are no complications, otherwise it can be a real challenge.
We quickly disassembled the phone and started with the full diagnostic procedure to identify the cause of the fault. A common reason for this issue is the flex cable, which connects the buttons to the logic board. In this particular case that was the cause as well and we changed the flex cable immediately. After a simple test, it was time to put the parts of the phone back together.
The job was quick and clean, therefore it took us only 30 minutes to complete it successfully. Our client was really excited that he received his phone in perfect condition in no time.