iFixit

Disconnect the remaining connector.

Flip up the retaining bar to free the dock connector cable.

Close-up shot of the logic board. The logic board is two layers thick, so it's difficult to see components.

We haven't found a way to pry the two sections apart without damaging the logic board, so it's virtually impossible to tell you what's in there.

View of the iPhone with the logic board and battery removed.

Disconnect the antenna cable to the left of the dock connector.

Peel up the antenna ribbon sheet from the large black plastic piece.

You can now see why the iPhone has the black lower section of the back case. The antenna encompasses this entire region.

Remove the hollow black plastic piece that was covered by the antenna.

There is some empty space within it — the only open internal space.

There's a chip in the upper right that may be a touch screen control processor. Model numbers: S6087P1, GN03325, 2076A00R, and 1YFZASB3