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This class is about temporary power supply directly related to the trigger protection

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Many processors today are double-layered

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The upper layer is the temporary storage,

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that is, the running memory, and the lower layer is the CPU

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This is the processor commonly used in current mobile phones

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Because of its structure,

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regarding the temporary power supply problem,

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we do not need to distinguish it in the actual maintenance,

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that is, the temporary power supply

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There is no clear separation on the drawing,

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whether it is CPU power supply or temporary storage power supply

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We also need to pay attention to a problem through the structure

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The temporary storage is soldered on the CPU

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It means that the power supply for the temporary storage must come to the CPU first,

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that is, the power is first supplied to the CPU,

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and then connected to the temporary storage

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When we repair the trigger protection,

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we give the priority to checking the power supply of the CPU,

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temporary storage, and the hard disk

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This is what I said earlier

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When we check the short circuit of the CPU and the temporary storage power supply,

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we look at the two of them together

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Let's measure whether there is a short circuit in the power supply of the CPU or the temporary storage

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There is no need to distinguish the power supply between the CPU and the temporary storage

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Because of its structure,

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the temporary storage is welded on the CPU

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The power supply must first be supplied to the CPU and then supplied to the temporary storage

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So when we repair the trigger protection,

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we find out whether it is the CPU power supply,

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the temporary storage supply, or the hard disk power supply

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Which way of power supply has a short circuit,

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we don't need to distinguish which way the temporary stored power supply is

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We can directly test whether there is a short circuit in the power supply of the CPU

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This is a temporary power supply problem

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On the drawings, we see many descriptions

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For example, here is the description of the graphics card,

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The main description here is the power supply of the CPU

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This SM8250 is the CPU,

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and then LPDDR5 is described here, which is the running memory,

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but it is not clearly separated

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So in actual maintenance, we don't have to worry about this problem

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Okay, that's all for this lesson