After popping off a few EMI shields, we get a good look at the ICs on the logic board. They include:

Broadcom BCM5973KFBGH Microcontroller used for touchscreen

Broadcom BCM5974 CKFBGH capacitative touchscreen controller

Interestingly, the Wi-Fi board is attached to the logic board under one of the EMI shields. It can be easily pried off its socket.