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Let's measure a good mainboard of iPhone

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7 to see if its power supply conversion is consistent

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with the principle we have learned

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We first connect the power to the mainboard

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Let's measure the voltage from the battery to the charging tube

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4.18 V, it's normal

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The current is converted into the main power supply

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through the charging tube and the charging chip

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Let's measure the position of the main power supply

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OK, the voltage is normal

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Next, let's measure the voltage of the boost power supply

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OK, it's normal

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Let's measure the voltage of the power supply converted

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by the audio amplifier

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We can see that the voltage is normal

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Let's measure the voltage of the power supply converted by the vibration chip

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OK, it's also normal

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It can be proved by our measurement that when we buckle the adjustable power cord,

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the battery voltage will be converted into the main power supply

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through the charging tube and the charging chip,

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and the main power supply will be converted into the boost power supply

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after reaching the boost chip

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After the main power supply reaches the audio amplifier and the vibration chip,

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it will be converted to power supply to prepare for future circuit work