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iPhone block diagram

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In this video, we mainly explain the iPhone block diagram

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Block diagram refers to a logical relationship

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between common chips and other chips on the mainboard

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The block diagram can visually reflect the relationship between the chips

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When we get a mainboard, there are many chips on it

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we can't tell the connection relationship between the various chips

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when we look at the physical map

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By looking at the block diagram,

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we can identify who manages different chips

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What is the use of learning block diagrams?

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When we repair, if we find that the camera does not work,

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the direction of repair should be the CPU, not the baseband

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After distinguishing the logical relationship,

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it will help us to judge the fault in the actual maintenance

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There are two main chips in the iPhone block diagram,

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namely the CPU and the baseband

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The baseband chip is an independent chip,

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because Apple has no baseband design and production capacity,

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and the baseband chip is purchased from Qualcomm or Intel manufacturers

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In Android machines,

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the baseband is mostly integrated with the CPU

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The CPU and the baseband control different chips respectively

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The CPU is mainly responsible for the application part,

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and the baseband is mainly responsible for the chip that makes phone calls

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The application part contains many circuits,

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such as audio circuits, hard drives, cameras,

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displays, touch screens, and charging circuit

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These circuits are all managed by the CPU

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These circuit damages may be caused by CPU damage

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The baseband is only responsible for making calls,

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such as radio frequency, power amplifier,

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antenna switch, filter, etc.

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These calling chips are managed by the baseband

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There are also some wire connections between the CPU and the baseband

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Then these lines are mainly used to convert the signals

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of the application part and the telephone part

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For example, when we make a phone call,

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the sound is collected by the audio circuit

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After the audio circuit collects the sound,

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it sends the signal to the CPU, the CPU converts the voice signal to the baseband,

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and the baseband transmits the voice signal through the telephone chip

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The connection relationship between chips will not change

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with the change of version in the physical map

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For example, the iPhone XR mainboard is a single-layer mainboard

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with connecting components on both sides

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Different chips have different positions in the mainboard,

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such as touch screen, wifi, bluetooth, hard disk, main audio

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These chips are in different places on the mainboard,

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but they are still controlled by the CPU

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For example, the baseband is on the reverse side of the mainboard,

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the chip for calling, radio frequency, 2G power amplifier,

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high frequency power amplifier, low frequency power amplifier

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These call-related chips are in different places on the mainboard,

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but they are still controlled by the baseband

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For example, the iPhone 11 mainboard is a double-layer mainboard,

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and the components in the mainboard are distributed differently

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Hard disk, touch screen, wifi, nfc,

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these chips belong to the application part,

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they are still managed by the CPU

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Chips for making calls, such as 2G power amplifier,

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high-frequency power amplifier, and low-frequency power amplifier,

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are also in different positions on the mainboard,

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but they are still managed by the baseband

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Therefore, in the real world, the change of the version structure

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will not change the logical relationship between the chips

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Ok, this is the introduction of the iPhone block diagram