1, the appearance of: man-made damage (such as falling, falling, water, pressure, etc.) is still easy to see, especially pay attention to the corner of the place whether there is wear and tear;
2, after the boot to see: man-made damage, the screen will appear (cracks, flowers, water spray, black shadow, etc.), the menu is not set according to the selection of the emergence of the camera, taking pictures or video camera whether strange Phenomenon, etc.;
3, connected to the computer is as smooth as the original, there is no equipment can not be found, can not read the content, etc.;
4, brought to the after-sales testing (generally not a quality problem is not this service).
I hope my answer is helpful to you, thank you!
Halo, after-sales test will show a test report ah, you can rely on these reports to explain the problem!!!!