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The maintenance of iPhone startup constant current and current jump faults

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In this video, we mainly explain how to find the I2C bus

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I2C bus search method

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We first open the circuit diagram, bitmap and component map of the faulty model

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In the drawing, we directly search for the symbol I2C0_SDA

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When the search result is consistent with the internal name of the CPU block diagram,

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it means that it is the main I2C bus

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We only need to focus on measuring the main I2C bus

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Each I2C bus has two lines, including SCL and SDA

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Then when we search, we can also find that there are other I2C buses

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For example, SEP_I2C, SMC_I2C, and AOP_I2C, etc.

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After the main I2C bus is measured, go to measure other I2C

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For example, in the picture, SEP_I2C, SMC_I2C,

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some will have ISP_I2C,

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these are connected to some peripherals

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The main I2C is mainly to connect the chip

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After we find the I2C bus,

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we need to jump to the bitmap according to the name outside the box

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In the yellow point in the bitmap, we can measure the diode value and voltage

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When jumping, we need to jump based on these names outside

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After finding the I2C bus in the bitmap, we first measure the diode value

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If there is no abnormality, let's measure the voltage

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Let me demonstrate below

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let's take the iPhone 12 model as an example to find the I2C bus

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After we open the circuit diagram and the component map,

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we directly search for I2C0_SDA in the drawing

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After searching, there will be several results in the list, let's observe one by one

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U1000 is the CPU

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Then this module belongs to the I2C bus, but it is identified as ISP_I2C

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Then this kind of I2C bus belongs to the peripherals

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However, the bus name of this model is marked with NC,

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which means that these two sets of buses are not used

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Let's continue to look at the bus below

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This is also the name inside the CPU

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This is also I2C bus

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We can jump to the bitmap according to the external name

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The yellow point in the bitmap,

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we can measure the diode value and voltage of I2C bus

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Then this group of buses is to the logic chip

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Let's look at the list below

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The following is also the I2C bus

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This is the main I2C bus, the name is exactly the same,

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it contains from I2C0 to I2C4

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But I2C0 and I2C1 are unused, we don't need to measure

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I2C2, I2C3 and I2C4,

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we need to measure these six lines

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We jump to the bitmap according to the external name

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At the yellow point in the bitmap,

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we can measure the diode value and voltage

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Then we have to measure each of these lines

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So, that's it for this lesson