iFixit

Comparison between the iPad 3G's (left) and the iPad Wi-Fi's (right) logic board.

When comparing the two models, the top half of the Wi-Fi's rear case has copious amounts of open space.

Use the tip of a spudger to disconnect the GPS antenna ZIF cable connector.

The GPS antenna assembly can be pried off the plastic antenna cover with the flat end of a spudger.

The front and back of the GPS antenna assembly.

Lift the cellular antenna from its housing.

The cellular antenna remains.

From left to right: the Wi-Fi/Bluetooth, GPS, and 3G antennas, respectively.

The 3G board with A4 processor.

The second shot is the main board from the Wi-Fi iPad.

Key differences?

• The most obvious change is the addition of the connector on the right side of the board for the communications board.
• More subtle is an additional small IC above the A4 chip next to the connector for the GPS antenna. This may be a signal processor, but we can't firmly identify it: T3J 927 632567.

Bottom of the main board.

Nothing much to see here, it's exactly the same as the Wi-Fi board.

Apple soldered the EMI shield onto the communications board, making it challenging for us to show you the chips. Despite this adversity, we pressed forward undaunted, fearlessly unsoldering the board to reveal to you:

• Infineon 337S3754 PMB 8878 X-Gold baseband IC 5Y06115. This part had the Infineon logo in the pre-production unit, but Apple has white-labeled it to obscure the manufacturer. This is the exact same baseband processor as the iPhone 3GS.
• Skyworks SKY77340 Power Amplifier Module
• Three Triquint power amplifier / filters.
• Infineon U6952
• Numonyx 36MY1EE
• Along the right are three TriQuint power amplifiers: TQM616035A, TQM666032B, and TQM676031A. These are the same three chips that Apple used in the iPhone 3G nearly 2 years ago.
• Broadcom A-GPS BCM47501UBG F01003 P11 949871 SN

Bottom of communications board.

The second photo is from the pre-release FCC unit. The bottom of our board has additional part number markings, but is otherwise identical to the pre-production unit.

It's important to note that the Broadcom A-GPS package is on the communications board, explaining why the Wi-Fi-only iPad does not have GPS.