iFixit

The back side of the logic board:

• SMSC LAN9730 standalone USB to ethernet controller
• V301
• DELTA 8456E-R
• TI 54418 (2.95 to 6V, 4A, 2MHz step down current mode regulator)
• TXC Mn40 25.000 (25MHz crystal)

Looking closely it appears that there is another difference from the Apple TV 2nd Generation, two antennas!

While it is unclear where the two antennas terminate, we suspect Apple added the second antenna to address some complaints about range and signal strength in the previous model.

According to Broadcom, the BCM4330 can either function with a single-band 2.4 GHz 802.11 b/g/n (single shared 2.4 GHz antenna for Bluetooth and WLAN) or a dual-band 2.4 GHz and 5GHz 802.11 a/b/g/n antenna.

• We're suspecting that this Apple TV is preserving the 2.4GHz shared antenna, but has also added a second antenna for 5 GHz connectivity.

Apple TV (3rd Generation) Repairability: 8 out of 10 (10 is easiest to repair).

• Only six parts in a very easy-to-dissemble case.
• Separate power supply, which is easy to get to and replace in case your old one ever decides to jump off a cliff.
• No glue, thermal paste, gum, peanut butter holding things in place...
• Standard screws, no endangered species screwdrivers necessary.
• The logic board contains all the components, which means if something breaks, it could be expensive to replace -- unless you prefer to do board-level soldering.