During our iPhone 4S teardown, iFixit buddy Markus noted that the new iPhone had a rather unusual-looking black component next to the ambient light sensor. We didn't make much of a fuss about it at the time since we were knee-deep in disassembly pictures, but the little black box certainly piqued our curiosity.
Now that the teardown is wrapped up, we've re-opened the mystery and made a neat discovery about the 4S: that black component is an infrared LED, and the little bugger almost always wants to know if you're nearby. Read More
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