I’ve been trying to make a logic board upgrade iPhone 6 to 8 but wasn’t sure of it was possible since each gen has different pin outputs, can I just change the chip?
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Hello Alex, unfortunately even identical CPU replacements in iPhones are beyond even the best micro-solderer's ability. You could not even swap an A8 for another A8 taken from a different iPhone 6 motherboard. This is because the CPU, Modem, Flash memory, and eeprom chips are all paired to one another. So if i wanted to move a good CPU to another motherboard, I would actually have to move over all 4 BGA chips without damaging even one.
As to upgrades, typically the CPU and modem chips get redesigned/ upgraded each year, meaning the new motherboard is designed to fit a different package design. So besides all the issues of programming, the newer components would not fit onto older board's solder joints.
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Sorry no you can’t swap out the APU chip. The chips are very different and interact differently with the other components within the iPhone. Just review the IFIXIT teardowns here:
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