How do we test iphone series lcd screen assembly? there is mainly 2 point.
First, before they enter into market, iphone 4/4s screens need past factory's test. for example, no statics, no poor function, can do powerful sway test.
1. no dust, no dead pixel test, touch function test.

2. the frame holder should be glued with machine, not hand, its quality is more stable.

In order to let repairer save time, front cameral holder, anti-dust mesh, sensor circle and black sponge are preinstalled.