Hardware Stuff: What’s Behind the EMI Shields of an iPhone 4S Logic Board?

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OK – so you’ve seen the iPhone 4S running on iOS 5 and all the bells and whistles that come with it. Now let’s take a look what’s inside – deep inside – the logic board.

TechRepublic’s Bill Detwiler had recently disassembled an iPhone 4S and took detailed images of the innards of an iPhone 4S logic board.

Apple’s A5 Processor: This is a 1GHz dual-core processor (with 512MB RAM) manufactured by “arch rival” Samsung. Apple said that this processor provides “two times more power and up to seven times faster graphics” than the A4 chip.

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These chips appear to be the STMicro gyroscope and STMicro three-axis accelerometer which respond to 2D and 3D directional movement e.g. switching the iPhone from portrait to landscape mode, tilting the phone etc.

This is Qualcomm’s RT8605 (biggest chip on the photo) Multi-band RF Transceiver that is also used on HTC’s Thunderbolt.

The TriQuint TQM9M9030 chip is a dual-band duplexer bank.

Avago ACPM-7181 chip is one of the power amplifiers on the logic board.

Here’s another power amp made by Skyworks with the marking 77464-20 on it.

Here’s the Qualcomm MDM6610 baseband chip which ultimately made the iPhone 4S a ‘world phone’ that supports the following network:

  • UMTS/HSDPA/HSUPA (850, 900, 1900, 2100 MHz)
  • GSM/EDGE (850, 900, 1800, 1900 MHz)
  • CDMA EV-DO Rev. A (800, 1900 MHz)

Verizon’s iPhone 4 has Qualcomm MDM6600 chip on it.

The chip that manages power on the logic board is the Qualcomm PM8020 power management IC (PMIC).

And finally a Murata SW SS1830010 chip that holds a Broadcom chip to handle Wi-Fi/Bluetooth connectivity.

Well, it’s really amazing how these chips work together to give you an impressive mobile device like the iPhone 4S. The marvels of engineering indeed!

All images are courtesy of TechRepublic.

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  1. Pingback: iPhone 4S' Advanced Proximity Sensor is for Siri's 'Raise to Speak' | BeijingiPhoneRepair.com

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