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In this lesson we are going to learn about the logic chips

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In iPhone mainboard, the logic chip is a read-write ROM chip,

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similar to the program inside the BIOS chip

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We can use tools to read and write

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But the iPhone's logic chip,

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which internally stores the system's encrypted files and boot records

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If the logic chip is damaged, it will not be able to enter the system,

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and the data stored on the phone's hard disk,

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such as photos and chat records, will not be saved

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In iPhones, models prior to the iPhone x,

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the logic chip has four pads, which is very small

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iPhone 8 and iPhone 8p models,

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their logic chip is integrated in the inductor group

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This will make it more difficult for us to replace it when it is damaged

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On the iPhone xs and later models, the logic chip has nine pads,

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a bit larger than the earlier chips

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This is the mainboard of the iPhone 11,

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and this chip is the logic chip

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Logic chip damage will lead to stuck white apple,

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white apple restart, brush error and other problems

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On pre-iphone x models, when the logic chip was damaged,

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we could replace the chip and brush it

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The logic chip was not bound to the CPU in previous iPhone x models,

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only the internal programs were bound to the system

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For example, Apple's operating system is now 10.1,

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and the logical chip's boot file record will be bound to the system

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When the phone is upgraded to system 12,

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the boot records or encrypted file in the logic chip will be bound to system 12

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There is only one binding information for each machine

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After the logic chip is replaced, the binding information does not match

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As a result, the white Apple restarts and fails to enter the system

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Pre-iphone x models, after changing the logic chip,

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if we don't want the data, we just need to brush the machine,

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and we can enter the system normally

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On the iPhone xs and later models,

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however, this logic chip is tied to the CPU hardware

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When this chip is damaged, it is replaced with another type of chip

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The brush cannot get through, the system cannot get in,

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and a machine like this has to be scrapped

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Therefore, when repairing xs and above models,

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we should pay attention to observe whether the logic chip is damaged

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If it is damaged, you don't need to repair it

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You can return the phone to the customer directly

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Next, let's get to know these two types of chips in real life

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The mainboard is an iPhone 7 mainboard,

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and its logic chip sits on the top of the BOOST core, a small glass chip

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Logic chips are very small

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And when we zoom in, we see that it's basically the size of a capacitor,

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or a little bit smaller than a capacitor

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This is the logical chip

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This is the mainboard for the iPhone 8p

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iPhone 8, iPhone 8p model, logic chip is located inside the inductor group

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This long chip belongs to the inductor group,

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The logic chip is integrated inside it

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The mainboard is an iPhone xs mainboard,

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and the logic chip of models above xs is relatively larger, with nine pads

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This chip is called a logic chip,

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and we can see that it's much larger than the capacitor

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On the xs model and above, the logic chip and CPU are hardware-encrypted

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After the logic chip is damaged, the machine could not be repaired

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This mainboard is an iPhone XR model,

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and its logic chip is located in the lower right corner of the CPU

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As we can see, the logic chip of models above xs will be larger than the capacitor

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Before iPhone X, the logic chip was very small, smaller than the capacitor

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Like this one, it is the logic chip for the iPhone X and previous models

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Ok, that's all for this lesson