Here's a solution for Nokia X3-02 Camera hardware failure problem. The solution shows which components needs to check on the PCB board if the camera failed to work.
Note: you may first check, restore or flash update the device firmware before proceeding to hardware troubleshooting. If the firmware calibration already done but it didn't fix the problem, refer to the solution below and do have a check procedures on some components.
The camera of X3-02 is mounted on the flex board connection, you may first visually check the flex ribbon for possible damaged. There are two supply voltages needs the camera to work, the VAUX1 2.78V and the VIO 1.8V voltage. You may check and trace these two supply voltages, in most cases if these voltages losses it will result to camera failure problem.