A2894, A2651 mainboard size

• The A2894 and A2651 are regional variants of the iPhone 14 Pro Max. The main differences often lie in the modem configuration for cellular network bands (e.g., mmWave support in certain regions vs. others).
• Issue: Replacing the mainboard may result in compatibility issues with your cellular carrier, depending on your region and the bands supported by the new mainboard.

• Modern iPhones have tightly integrated components. Critical parts like the TrueDepth camera system, Touch ID (on models that support it), and the battery are paired to the original mainboard at the factory.
• Issue: After swapping the mainboard, features like Face ID, True Tone display, or even basic phone functionality may not work without reprogramming.

• Each iPhone mainboard has a unique IMEI and activation profile tied to Apple’s servers.
• Issue: Swapping mainboards could cause activation problems, rendering the phone unusable unless reprogrammed by Apple or a skilled technician with specialized tools.

• While both models share the same chassis, there could be subtle differences in the connectors, screw layouts, or component placements.
• Issue: Mismatched parts may prevent the phone from being reassembled properly.

• Any unauthorized hardware modification will void Apple’s warranty and could make the device ineligible for future repairs at Apple-authorized service providers.

• Professional Advice: Consult a skilled repair technician experienced with iPhone repairs. They may be able to advise if the swap is possible or feasible.
• Compatibility Check: Verify the cellular band support and any hardware-specific differences between A2894 and A2651 to ensure compatibility.
• Alternative Solution: If the mainboard is faulty and you’re looking for a replacement, try sourcing an identical A2894 mainboard instead.

If you decide to proceed, ensure you have the necessary skills, tools, and access to software required for reprogramming components and reactivating the device.

Best,

Christian