The cause behind a repeating pattern in the way a very small amount of iPhone Duo screen cracks may have been discovered, with a failing element of the hinge believed to be causing the most damage.

Since the launch of the iPhone Duo, there have been sightings of cracked screens within hours of its release. While infant device failures are to be expected for major product launches, there is an consistency in the way that the screen itself is cracking.

Observing videos such as the JerryRigEverything "test" and posts to Reddit show the screen cracks in a fairly typical manner when under stress. In quite a few instances, the fault develops at the crease line and spreads out horizontally to the edge.

The expectation is that it's the screen itself cracking during the bend, but there's also another component that may be the cause.…