All ICs are located on the front side of the motherboard:

Elpida BA164B1PF 2 GB DDR2 RAM + Qualcomm Snapdragon 600 quad-core 1.7 GHz CPU

Samsung KLMBG4GE2A 32 GB NAND flash memory

Qualcomm PM8921 power management IC

Qualcomm MDM9215M 4G GSM/UMTS/LTE modem

Synaptics S32028

TriQuint TQM7M9023 multi-band power amplifier

Broadcom BCM4335 single-chip 5G WiFi™ 802.11ac MAC/baseband/radio with Bluetooth 4.0+HS & FM receiver