iFixit

At this point, the rear facing camera can be disconnected from the logic board.

Unlike the iPhone 4, the fourth generation Touch's rear-facing camera does not support autofocus and is a much lower resolution.

• For those of you who are wondering, there's no way the iPhone 4's rear camera can be installed in the Touch without some extreme hackery.

This camera is 6.5 mm square by 3.3 mm tall. That is dramatically smaller than the iPhone 4's rear camera.

Just above the rear camera, the cylindrical silver object is the microphone, a new feature for the iPod Touch line.

The front-facing camera is readily accessible and can be disconnected from the logic board at this point.

Unsurprisingly, it looks just like the iPhone 4's front-facing camera.

• We're not surprised: they have the same resolution.

This camera is 4.9 mm square and 2.5 mm thick, slightly (0.3 mm) thinner than the iPhone 4's front facing camera.

Next, we disconnected the Touch's singular external antenna.

This antenna is presumably used for Wi-Fi reception and is situated near the front glass panel when the Touch is completely assembled. Its new location eliminates the need for the plastic "window" found on the 3rd generation Touch.

Finally! We found some serious chips.

This iPod features the same A4 processor that's found in the iPad and iPhone 4. The Toshiba chip is very similar to the one which was present in the iPad in the FCC teardown, that was replaced by a Samsung one.

The key marking of interest on the A4 processor package is K4X2G643GE. This is identical to the marking found on the iPad processor, but different from the iPhone 4 processor. The iPad has 256 MB RAM, while the iPhone 4 features 512 MB. Unfortunately, this means that like the iPad, the new iPod Touch includes only 256 MB of RAM.

The NAND flash memory is now provided by Toshiba, not Samsung like that of the iPad.

Probably the WiFi and Bluetooth-Chip.

And no, there's no RAM upgrade slot.

There are a few more chips at the other end of the logic board.

• On the far left is a 338S0859 chip. It's similar to the Cirrus Logic audio codec of the iPhone 4 (338S0589).
• The new AGD8 2032 gyroscope is very similar to that one of the iPhone 4.
• The 2032 33DH chip is found next to the gyroscope. It seems this chip was packaged in the same die with the gyroscope in the iPhone 4.

You can clearly see the 30 pins of the dock connector, located just below the row of chips.

The iPod Touch now has a legitimate speaker, although we doubt it'll satisfy many audiophiles.

Apple appears to be routing the audio out not only the newly-added speaker grill (large hole), but also out of the dock connector (small hole).

What's this? Empty space?

We don't know what this white plastic piece does other than take up space. Perhaps it's a weight-saving device.

iPod Touch 4th Generation Repairability: 4 out of 10 (10 is easiest to repair)

Good: Opening the device is pretty straightforward, as long as you have a heat gun and some iPod Touch opening tools handy.

Good: The headphone jack is not soldered to the logic board, a first for the iPod Touch line.

Bad: The front glass and LCD are permanently fused together, increasing the cost of repairing broken front glass.

Bad: Removing the display completely requires removing the logic board

Bad: Apple soldered the volume button and sleep button cable to the logic board. The previous Touch had a ZIF connector. This makes removing logic board very difficult.

Bad: The battery is still soldered to the logic board, just like previous models.