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iPhone trigger circuit

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In this video we're going to learn about the no trigger repair process

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In the maintenance, we are going to repair from the simple to the complex step by step

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No trigger maintenance process 3

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After we eliminate short circuit or broken wire of the switch pin,

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we need to measure whether the standby power supply is normal

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Because the power supply provides the operating voltage to the CPU and the switch pins,

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an abnormal voltage will cause the power not to start

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So let's measure it

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Let's start by opening the bitmap of the iPhone 6

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Select the Find button, select the search signal,

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and enter PP1V8_ALWAYS

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We can measure the standby power on the yellow positions in the bitmap

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After the mainboard buckles the boot cable,

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we measure PP1V8_ALWAYS in the reverse side

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According to the bitmap, we find the measuring position

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Now we can see that it has a voltage of 1.78V

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This is the standby power supply after the power cord is connected

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For the actual measurement,

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the measuring point is inside the shield, so we can cut it off

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If the voltage is abnormal during the measurement,

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we will replace the power supply directly

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After replacing the power supply,

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if the voltage is not normal, it indicates that the CPU is damaged

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We have to return the machine to the customer

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So that's all for this lesson