Camera stopped working, how to check if it's hardware problem? I'm quite sure this is hardware problem. I tried the following: 


cleared application cache and restarted phone
tried alternative camera applications
reset phone to factory settings (still doesn't work) 


There is just error message saying: 


  Unfortunately, Gallery has stopped. 


Now I suspect it could be Gallery app problem. I rooted the phone and used super user app to disable Gallery and than install alternative gallery app. Still not working, now error is 


  Camera has stopped working 


Is there any way I can check if actual camera is broken? I'm using Android 4.2.2 on the Doogee DG130?

Log file ( part about camera ): 
https://drive.google.com/file/d/0B0-PZcQ_Q9-ZV1pON0ZlMzNjck0/edit?usp=sharing

Here is the exception stack trace from the logcat

08-19 17:03:08.098 W/dalvikvm(18229): threadid=14: thread exiting with uncaught exception (group=0x414369a8)
08-19 17:03:08.098 D/IPCThreadState(18229): [DN #5] BR_CLEAR_DEATH_NOTIFICATION_DONE cookie 0x50840260
08-19 17:03:08.100 E/AndroidRuntime(18229): FATAL EXCEPTION: Camera Handler Thread
08-19 17:03:08.100 E/AndroidRuntime(18229): java.lang.RuntimeException: startPreview failed
08-19 17:03:08.100 E/AndroidRuntime(18229):     at android.hardware.Camera.startPreview(Native Method)
08-19 17:03:08.100 E/AndroidRuntime(18229):     at com.mediatek.camera.AndroidCamera.startPreview(AndroidCamera.java:168)
08-19 17:03:08.100 E/AndroidRuntime(18229):     at com.android.camera.CameraManager$CameraHandler.handleMessage(CameraManager.java:168)
08-19 17:03:08.100 E/AndroidRuntime(18229):     at android.os.Handler.dispatchMessage(Handler.java:107)
08-19 17:03:08.100 E/AndroidRuntime(18229):     at android.os.Looper.loop(Looper.java:194)
08-19 17:03:08.100 E/AndroidRuntime(18229):     at android.os.HandlerThread.run(HandlerThread.java:60)


And this is entire log for last 2 minutes ( while I was opening a camera ):
https://docs.google.com/file/d/0B0-PZcQ_Q9-ZTW9QeTVKdk1NdEU/edit?pli=1
Check out this application to know whether it has Camera/Hardware problem - 
System Info Droid
It provides whole summary of the device.